Parts

Introduction

If you are using the iMac 27" late 2009 or 2010 model for games you might want to upgrade your graphics card to the 6 series of the last 2011 model.

For any other reason this upgrade is not recomended as the power gain is only noticable in games.

Image 1/1:
  • Remove the eight T10 Torx screws securing the LCD to the outer case.

The replacement display I received did not have a bracket around the edges so I can reinstall it. On the old display, it seems the bracket is screwed in, but even with all screws removed, I cannot get it to budge. Is there a trick? Is this even possible?

wooten1138 - Reply

Image 1/3: Due to tight tolerances, you will have to use a thin hooked tool to lift the display out of the outer case. As seen in the third picture, we made one out of a bent paperclip.
  • Carefully lay the iMac stand-side down on a flat surface.

  • Due to tight tolerances, you will have to use a thin hooked tool to lift the display out of the outer case. As seen in the third picture, we made one out of a bent paperclip.

  • Use a thin hooked tool to lift one side of the top edge of the display by its steel outer frame.

  • After lifting the top edge of the display on one side, hold it out of the outer case while you use a hooked tool to lift the other side.

  • Do not lift the top edge of the display out of the outer case too far, as several short ribbon cables still connect the two components.

Be careful with any tool while lifting the edge of the display. Under the top left edge of the display sits the bluetooth-antenna-connector. I pulled it out while lifting. It was not such a great problem, cause i could just plug it in again. But maybe you could cut the small cable depending on the tool you use to lift.

Gee - Reply

The display is quite heavy, an is fitted with a tight tolerance. I found it very difficult and dangerous, lifting it with any tool in one corner while the iMac was lying down. Instead, after removing the T10 screws, it was quite easy pulling the display out of the iMac with my fingers on both sides, while the iMac was in the upright position. By doing that, you can easily hold the display with one hand and reach for the connecting cables with the other

Georg P - Reply

I broke the short ribbon cable that attaches to the inner top of the display but all the pics show the display completely removed after all cables are disconnected without the short ribbon cable intact. Does this short ribbon cable have a purpose and does it need to be reconnected? If so, how? Or is it just some worthless control put in by Apple to show its been messed with when brought back for repair? Thanks

alligator69 - Reply

Image 1/2: Be sure to pull the connector parallel to the LED driver board, straight out of its socket.
  • Using your fingers, carefully pull the vertical sync cable out of its socket on the LED driver board near the top left corner of your iMac.

    • Be sure to pull the connector parallel to the LED driver board, straight out of its socket.

This cable is very small and fiddley to remove if you don't have much in the way of finger nails. The cables are very thin and fragile.

James York - Reply

It took me a bit of work to remove this cable, it was a hassle actually. What worked for me, without any tools, was to use your index and middle fingers' nails and pull it. That worked better than the index and thumb. Took me like 15 minutes, more than what it should take.

thefinalzeta - Reply

Yes, me too! It stuck terribly hard and I spent most of the time for the repair for this s**** little connector. I thought all the time, I'm gonna break it or tear off these tiny cables... All the other cables were *rather* easy-going. In the end I finally got a new SanDisk Ultra II 480 GB SSD working.

And thanks to the SDD Fan Control app it is sooo silent. Thanks to Exirion!

Nick van Hill -

When the cable comes out, make note of which side has the gold contacts visible. On my cable, you could only see them from the "top" side (aka, as you look down on it). From the "bottom" or back side of the cable, you could NOT see any gold contacts. This will help to orient the cable when reconnecting it.

markcerv - Reply

In my case, all the cable connectors were oriented having the golden contacts, as seen from the wide side of the connectors, oriented facing away from the board

Georg P - Reply

Image 1/1: Pull the display data cable connector away from its socket on the logic board.
  • Squeeze the two display data cable connector arms together to unlock it from its socket on the logic board.

  • Pull the display data cable connector away from its socket on the logic board.

This connection is very fragile, and many people have broken the display connector on the logic board. You need to carefully pull the connector out, and when putting it back together, you need to carefully push the connector back in.

pmah - Reply

i did break mine. do you know where to buy that component?

Cris - Reply

Image 1/1:
  • Rotate the display out of the outer case enough to disconnect the LED backlight power cable from the LED driver board.

You need to squeeze the connector top to unlatch, then pull it parallel to the LED backlight board.

Charlie - Reply

Image 1/1: If your fan is spinning full speed after completion, check this connection or the hard drive's thermal sensor cable.
  • Lift the display for enough clearance to disconnect the LCD thermal sensor cable connector from its socket on the logic board.

  • If your fan is spinning full speed after completion, check this connection or the hard drive's thermal sensor cable.

Before you take/remove the LCD thermal sensor cable connector from its socket, make a note of which color cable is on the left, and which is on the right. When I removed the cable, the black cable was leftmost, and the grey cable was rightmost.

markcerv - Reply

I replaced hard drive and added a second SSD on a 2010 27" iMac. Everything seemed fine for about a year, and now the fans run continuously. I think it's this cable in Step 8; I'll get around to opening it up to check.

pigeonf16 - Reply

Image 1/1:
  • Carefully pull the display toward the top edge of your iMac and lift it out of the outer case.

And if the panel has no frame? How you unattach the frame from the old panel to place it on the new one?

Daria Drozd - Reply

Image 1/1: Be extra careful with the display cables, I broke mine
  • Remove the display as described on ifixit

  • Be extra careful with the display cables, I broke mine

  • You need to remove the temperature sensor cable from the HDD to remove the card

  • Remember the position of this cable! ifixit tip: it must later be reinstalled closest to the SATA connector and the black cable need to point up, towards the LCD

Add Comment

Image 1/2: Locate the large heatsink from the graphics card, which should be right above your DvD drive
  • Now remove these 3 screws from the graphics card brezel seen in the left image

  • Locate the large heatsink from the graphics card, which should be right above your DvD drive

  • Remove the single screw there holding it in place

  • Carefully remove the graphics card temperature sensor cable from underneath the motherboard

  • Remember the position as you need to plugin the new one here as well

*Use Hemostats or tweezers when it comes time to remove the graphics card temperature sensor cable from underneath the motherboard make sure you grab it by the top and bottom of the plug and not from the sides. For example if your pinching at the plug make sure your thumb is on top and other finger is on the bottom, not from the sides! Look at your imac like your using it and either hold the unattached heat heat sink/GPU in your left hand while you reach around the back and behind the mother board to find the temp sensor. I used a pair of hemostats and pulled the plug by the top and bottom and it pulled right out.

mattier303 - Reply

Image 1/1: Make sure the metal brezel of the card doesn't scratch the motherboard
  • Slowly and carefully pull the graphics card up and away from the motherboard

  • Make sure the metal brezel of the card doesn't scratch the motherboard

  • You should be able to remove it easily and when you removed the temperature sensor cable you have it safely in your hand

Add Comment

Image 1/2: Store away your graphics card safely in case you need it again or want to reinsert it
  • Remove the metal brezel from the graphics card. Only a couple of screws hold it in place

  • Store away your graphics card safely in case you need it again or want to reinsert it

  • The second image shows both the 4 and 6 series side by side. A little difference in height makes some extra work necessary (see next step)

the increase in heat emission is 85W -> 250W! use Macs Fan Control to speed up your fans and while you're at it, replace thermal compound on the card.

jes ta - Reply

  • You will need to remove the DVD drive in order to remove the plastic piece mentioned in the next step. The drive is held in by 4 Torx screws, once those are removed, the drive can be lifted and swung out of the way without removing any cables.

where is te image???

Luis Manrique - Reply

Sorry to be so bland, but +1: Where is the image?

socklint - Reply

Image 1/3: Remove the plastic part which is shown on the 2nd picture by removing one screw and carefully pull it from the aluminium case
  • As the 6 series is slightly higher we need to make a little space on the plastic holder which is beneath the card

  • Remove the plastic part which is shown on the 2nd picture by removing one screw and carefully pull it from the aluminium case

  • Its fastended with tape, so don't worry, you can't break anything

  • Some wiggling and navigating it from the cables and you should have it in your hands

  • You see the rectangular space where the large cable goes through. Use a saw or other tool to make it about 5mm wider and 2-3mm deeper

  • The third image shows the final result we want to achieve

  • The primary reason for thi step is the heatpipe of the 6 series which takes more space

  • Note: this is ONLY necessary on the late 2009 model, 2010 models already got enough room!

Had to do this on a 2010 i5, not enough room otherwise!

- removed 2x3mm piece on the left corner of the gap

- made the gap 4-5mm deeper

jes ta - Reply

I have an early 2011 iMac 27 whose video is starting to die. I installed smc fan control and have extended it's life about a month or so. First Panic Crash in my logs was back in April 9 2015 (4 years after purchase) It turns out the AMD Radeon 6970M has a known manufacturing defect and Apple has extended warranty for four years. The first authorized Apple Repair Center I went to Tirosys in Georgetown has declined to do the repair. I'm now down at Austin Genius Bar waiting to review the issue with the other Genii on staff. :)

xstek99 - Reply

Does the 2010 5750 heatsink fits on the 6970? On ebay there are many 6970 card without heatsink at good price, and if the heatsink fits it would be nice.

mchigioni - Reply

I was wondering the same thing. I would like to use the heatsink from my 2009 4850-512 card. Does anyone know if the 4850 heatsink fit the 5670, 6770 and the 6970? They look very similar, the only difference I see is that the 6970 has a third heat pipe which might only be for the 2gb version

Jose Rodriguez -

Hi, did you get an answer?

I've ordered a 6970m card but I think it doesn't have the heatsink... :/

http://fr.aliexpress.com/item/for-AMD-Mo...

Or should I buy this too?

http://fr.aliexpress.com/item/New-Best-G...

Thanks a yon for your help

Mathieu

Mathieu Terzian -

Image 1/2: Now insert the 6 series graphics card carefully.
  • Apply the metal brezel to the new 6 series graphis card. Make sure its aligned properly

  • Now insert the 6 series graphics card carefully.

  • Make sure you don't damage the upper side of the mother board when reinserting

  • When in place fix it by the 3 screws

  • Reinsert the temperatur sensor cable. You need fine hands or a good tool to do so. Be patient with this step

connecting the temperature sensor cable was quite challenging. It helped to stand the computer up right, use tweezers, prebend the wires so the tip was in approximately the right position to be reinserted. I realized after having someone hold a flash light for me that I had been attempting to insert the cable facing the wrong direction. I shouldn't take to much force or effort to get the cable to plug in. Best of luck.

Lucas Scott - Reply

HI all,

Yesterday I build in a refurbished Radeon 4850 512MB in my late 2009 iMac 27". It's an upgrade form the original 256MB which has broken.

The installation of the card went good so i took it for a test and everything seems to be running perfectly. After about 15 minutes of idle the mac goes in standby, when trying to wake up, the display stays black. A cold restart (holding powerbutton for 10 sec) the mac reboots (I can hear the chongsound) but even then display stays black. I tried serveral things but nothing really worked so I turned it off to try it in a couple of hours. I started the mac and voila, my display works again. My guess is that there is a cooling problem so I installed iStat to boost up the fans tot 1800. This worked cause the display didn't turn black.

does anyone know what could be de problem that the mac doesn't managed the cooling it self?

Jochem - Reply

I'm really interested in do this upgrade as well. To solve the problem of the temp sensor cable I'm thinking to cut the cable, and solder in an extension that give me lots more wiggle room. That way I can leave the tiny motherboard connector where it is.

I also use MacFansControl, but you could base the OOD fan speed on the GPU diode temp, so the heat sink sensor is redundant.

I also base the CPU fan on the PSU temp. Both are set to start at 45degC and be at full speed at 65degC. Ok it's a bit noisey, but everything runs cool, and the in game sound usually masks it anyway.

joldemans get MacFansControl, there is a mac version and a windows version for bootcamp.

pgleesonuk - Reply

Your post is dated 11/20/2015 and it is now 09/06/2016. Did you ultimately perform the upgrade? If so, with what card and how did it go?

James Wages -

Image 1/1: No other work needs to be done. As you removed the power cable the SMC should reset, which is the chip configuring your hardware
  • Reassemble the LCD display as explained on ifixit.

  • No other work needs to be done. As you removed the power cable the SMC should reset, which is the chip configuring your hardware

  • If all goes well you should be greeted with a welcome screen and "about this mac" should show the image to the left

  • Note: I also replaced the DvD drive with a 256GB SSD which can be done easily during the installation process

  • Last tip: if you remove the DvD drive for a SSD make a minimal bootcamp partition and install windows on it. It will save you a lot of trouble if you ever need one. Believe me, simply do it, installing bootcamp with no DvD drive is a pain.

Add Comment

Conclusion

To reassemble your device, follow these instructions in reverse order.

30 other people completed this guide.

57 Comments

works perfectly ;-) just be slow and precised

franckmichotey - Reply

Did you know you can add an additional SSD drive WITHOUT needing to remove your Optical drive? It installs vertically just to the right of your HDD. I just performed this upgrade last weekend. I believe you can do this to 2009 and up models.

bistroengine - Reply

Regretfully Not on the iMac late 2009, because the motherboard has only 2 SATA ports, not 3 like the 2010 and later models...

Andrea Turriziani -

Just a question: with this mod, are you able to use Airplay Mirroring in Mountain Lion? Since the inhability to use it on these macs is GPU-related, virtually with this Graphic card you may be able to enable it... Let me know please!!

Andrea Turriziani - Reply

I read somewhere that AirPlay mirroring uses a technology on the processor called Intel Quick Sync Video, ant it is present only in the 3rd+ generation of Intel Core ix processors. So if this is true it explains why some Macs do not have AirPlay mirroring and why you do not get AirPlay Mirroring after updating the graphics card.

ivanfacil -

If your system didn't support Airplay before the upgrade it won't do it after the upgrade - I think. I never tried but I doubt it works.

teut986 - Reply

I think the same... But don't know, maybe the system recognize the updated graphic card and unlocks airplay... Someone that have tried this mod, can confirm please?

Andrea Turriziani -

I have a mid 2010 imac. Have upgraded the hd to ssd. Also upgraded the ram. I would love to upgrade the video card to a 6970m.

It appears to be compatible?? Also, it seems that these video cards are insanely expensive. You can almost buy a whole computer for what they are asking for the card by itself. Are you aware of any good sources for these cards?

poberman66 -

This looks like a great upgrade for a late 2009 iMac - but what about swapping the logic board at the same time, with an i7 board from either 2009 or 2011? Has anyone successfully done this upgrade?

Jamie Lodberg - Reply

Done perfectly on my friend's 27" mid 2010. (5670 out 6970 in)

Do you know if 6770m is also compatible? (I've another Imac 27" with burnt 5670 and owner want replace with 6770m).

Antonio - Reply

I just did this upgrade on my iMac using a 6770 and it was easy. I didn't need to make any modifications to anything. The 6770 and heat sink fit the existing mounting bracket perfectly.

kbwell -

Worked on my EMC2309. Premiere Pro lets me use the Mercury Playback Engine now.

stuartjporteous - Reply

Rendered a file in Premiere after upgrading - back of the case is almost too hot to touch now.

stuartjporteous -

You said it was super hot??? You installed the iMac 2011 Radeon 6970 2GB graphics card??? I am thinking about doing this so I can use Premiere and After Effects. Would you recommend it? Did you end up using this for video editing?

Travis -

I installed the iMac 2011 Radeon 6970 1GB graphics card. It's hotter than the old card and I can hear the fan working, but not too much. No crashes, nice and stable. Yes, I ended up using this for video editing: Premiere and After Effects - the Mercury Playback Engine uses it. Recommended upgrade.

stuartjporteous -

i already have an mid 2011 imac, and im wondering if i could still upgrade the gpu to a newer one and what my options are like which amd cards work and will any nvidia cards work?

Freddie Wright - Reply

Is it possible to upgrade EMC 2309 with 2GB Graphic Card? It is not recommended by WeLoveMacs.com, but I really want to try it. Anyone has done it?

31150 - Reply

Done on a 2010 i5 2.8. I also did the following improvements while in there:

- i5 2.8 -> i7 2.93

- installed extra SSD

- RAM 4Gb -> 16Gb

What i found:

The 6970 2Gb emits 250W of heat compared to 85W of the original 5750 (in my machine).

Since the ODD fan cooles the GPU heat sink but the sensor used to control the fan is the ODD temp sensor, the card will get REALLY HOT (97.5°C tops) and fall back into power safe mode to conserve energy and cool down.

What i did:

I put the SSD in between the original HDD and the Optical Drive so it doesnt block air flow from the ODD fan to the GPU heat sink.

I applied new thermal compound to the card. Old one was really thick and not well spread.

I installed, and HIGHLY RECOMMEND this programm (both in windows 7 and OS X): Macs Fan Control

It lets you set the sensor, the base temp and the top temp for all three fans individually. Set the ODD fan to use the GPU heat sink as temp source and set temps to min:35 max:70. I'm getting a max of 78° which is fine for the card.

Bam, problem solved.

jes ta - Reply

Above TDP are for standard cards. iMacs have the mobility version.

Radeon 5750m emits 25W, 6970m emits 75W.

Still three times as much.

jes ta -

I have a late 2009 imac 27" model, and found that my graphics card is bad so. My question is since this thread hasn't Ben updated to this year. Where is the best place to purchase a graphics and what is the best recommended card to get now?

Tdog - Reply

I have one that was used briefly, until my HD crapped out too. Should still be fine, if you are interested. Otherwise I found it through EBay, I can PM you the seller.

Milw -

Hey Milw,

im having the same problem now and saw your post to Tdog, was just wonodering if i could get more details about the part. would appreciate it. thanks

gyaki -

This sounds amazing!

Just to confirm though, is the heat problem for any model including the EMC 2374? So did the author have to change fan settings and thermal and apply thermal compound? Or is it only for the 2010 i5 2.8 only that needs this?

The EMC 2374 has an ATI Radeon HD 4850 512 MB. I'm not sure about its emittance.

Gato - Reply

I have a 4850 on 2009 imac emc 2374 which is all most dead.I was looking to replace it with another card but i am not totally sure which ones are compatible.Are the 6770's from the 21 inch imacs ok or any nvidia cards?A list would make things loads easier as these cards are scarce enough as it is.

Christian Ivey - Reply

I have a replacement video card, but every instruction I've seen shows the graphics card with already attached heat sink. What special problems should I look for when removing the video card from the heat sink and attaching a new one(already have a thermal compound)? I've fixed quite a few machines, but this is my first Mac repair.

William Glazier - Reply

Any recommendations where to purchase this card now?

hellohogo - Reply

I got an iMac 27" late 2009 with a AMD Radeon HD 4850 and I NEED to change it.. Is it possible to replace it by an Nvidia GeForce GTX 760M or better ? Cause i really don't know how to do it. And if that's not possible tell me which graphic card could be great to play battlefield 3 at least and battlefield 4.... I'm lost with this theme... Please

Vanya Karamehmedovic - Reply

The hardest step is reinstalling the temp sensor connection under the main processor board. Almost impossible but got it with extreme patience.

Nick Martello - Reply

Good evening, I own a 27 inch imac late 2009 to more than I can not use it, since I have appeared hialle vertical lines on the screen. Mac fails to boot! What can it be? can you help me ???

Antonino Leandro calafiore - Reply

Hope this will help you.I had the same problem but could still boot in to safe mode which loses functions such as sound and playing videos.A temporary solution if you can boot into safe mode is to delete all the graphics kexts. This then allows you to boot normally but you with reduced graphics performance.You will not be able to play videos in full screen smoothly ect but you can still use your mac.You will probably need to change the card or get yours repaired.

Christian Ivey -

In my case, the video card had to be removed a different way. My particular model (A1312) required the removal of the power supply, IR port, DVD drive and fan, and finally the logic board. The card could then be unscrewed from the metal frame, and the replacement put in. After that, everything had to be reassembled, and plugged back in. Works fine, but it sure was a pain!

jkurrle - Reply

Great guide.

I just upgraded my late 2009 iMac 27" (iMac11,1) replacing the HD4850 with HD6970/2gb yesterday.

I did have to cut out the plastic bezel underneath the video card as shown in the iFixit guide where there are a bunch of cable, to allow the card to slide underneath the PCB into the connector.

Connecting the heat sensor of the video card is a pain. And after the install in iStat the GPU die temp does not show up. however since i am controlling the fans manually I am not to worried (i still have GPU heatsink info and all the other temped indicators)

I bought the HD6970 from macpremiumparts on ebay. They were great, fast shipping to Australia. The card works great!!!

yoshinobukawahara - Reply

does nayone know if the mid 2011 27 inch imac has an intel hd integrated graphics card as well as the amd radeon 6970m?????? i always thought that was the only gpu i had(amd radeon6970m) until i used a temperature monitor app and it displayed BOTH the amd radoen 6970m and also an INTEL HD 200 grahics card(integrated) iam going to attempt to disable the integrated card so that it only uses the radeon 6970m. But i dont want to mess with the bios if it isnt true. I cant find anywhere online where somebody has confirmed that the 27 inch 2011 mid imac has both cards built in. please le tme know if you can help. thank you very much in advance.

ilovecocoakrispy - Reply

hey did you ever figure out how to replace the GUP on the 27 inch imac? I've got the same issue, it works great but i want to upgrade the GPU . Thanks - email me at jamesdaley1@gmail.com

James Daley -

It's spelled *bezel* ... otherwise, impressive work.

redin575 - Reply

are you able to install a m4000 or a m6000

sidebee s - Reply

Hello,

is it possible to use a 6970m intended for a Dell laptop? visually I don't see any differences.

Regards

nicovanunen - Reply

Have you seen that one?

GPU update iMac 2011

Looks that it will work, i'll try soon.

edukaz1 -

This is an old post, but just FYI. From everything I have read, it sounds like you definitely can not just buy a generic Radeon MXM card with the same model number. That will only have the BIOS for a generic PC (like, the kind that you would install Windows on). You need a card that came from a Mac so it will have the Mac firmware on the card. Otherwise, it will not be recognized. There is apparently a way to "flash" a generic card with the Mac firmware, but I have no idea how to do that and what special equipment is needed.

Matt G -

hi in last step >>

Last tip: if you remove the DvD drive for a SSD make a minimal bootcamp partition and install windows on it. It will save you a lot of trouble if you ever need one. Believe me, simply do it, installing bootcamp with no DvD drive is a pain.

How to create bootcamp partition and install windows on it? And if i need to format Windows With out DVD?

hacker tom - Reply

Hi Guys,

is it complicated to replace Graphic Card/Video Card ATI Radeon HD, 4850 512MB in 27" iMac (Late 2009) Serial Number:VM022CDA5RU. Really need help!

Thanks !

Dawid Otta - Reply

Hi Guys,

is it complicated to replace Graphic Card/Video Card ATI Radeon HD, 4850 512MB in 27" iMac (Late 2009) Serial Number: VM022CDA5RU. Really need help!

Thanks !

Dawid Otta - Reply

Nope, did this a few days ago. Works perfect!

thenewemailforpsn -

Was wondering if Heatsinks are interchangeable? The cards are cheaper without the heatsinks. Would like to use the heatsink from my 2009 4850-512 card. Does anyone know if the 4850 heatsink fit the 5670, 6770 and the 6970? They look very similar, the only difference I see is that the 6970 has a third heat pipe which might only be for the 2gb version

Jose Rodriguez - Reply

I'm in the exact same situation, except I already bought the card not realizing it didn't come with a heatsink. I don't know the answer, but I'm pretty sure that third thermal pipe IS important for keeping the card cool. Otherwise it'll just shutdown your computer every time it gets close to overheating (the issue I'm currently having).

Did you ever get this resolved?

Josh -

I picked up a late 2009 iMac 27" from a kerbside pick up in fairly new cond.. lucky me, I'm thinking not,it turns on all sounds are there but black screen..

Can someone please explain to me why an what's needed to fix this problem , I can teardown and fix almost everything I put my mind to but this black screen has got me

Mario fucuto - Reply

How does the 2009 iMac 27" monitor "glass" screen come off if I have suctions will it come off or do I need to help peel the monitor "glass" around the outside please help I can't seem too find a explanatory/instructions teardown

Mario fucuto - Reply

$@$* just cracked the f*#&ing screen

Mario fucuto - Reply

Ahh I think I'll wait for some commonsense

Mario fucuto - Reply

I'm sorry it cracked! It's just held on by magnets, so the iFixit suction cups should work pretty easily. It's possible to open it up with knife/fingernails, but maybe that risks the cracking you experienced.

rothbamberg -

What I am wondering, is it possible to add any mobile graphics mxm 3.0 card? Why would the 6970 be the best card possible?

jort - Reply

My Experience:

- Late 2009 iMac previously with 4850 512mb card

- Upgraded to 6770 512mb; i was scared to go up to the 6970 due to the recalls and over heating..

- the late 2009 is the magnets so it's actually pretty easy with an iphone suction cup or strong fingernails.

- the cable for the temp sensor was actually easy; i got a little lucky. With tweezers i just got it up close so it rested with the pressure of the wire; then used the back(flat side) of the teasers and gently pushed up.

- about 1.5 hrs to do; tops

- When you first power up; takes longer than normal. I suppose to recognize the new card and install drivers, etc.

Why did i do this?

- woke up the computer and the screen froze; except mouse.

- reboots would show apple screen boot and then stay on a white screen.

- safe mode booted; but strange colorful bards (about 1" thick and vertical) across the screen every few inches.

- booted straight to windows 10; after boot logo it would just stay on a black screen.

Campinator - Reply

I'm seeing these on eBay for ~$250; am I looking at the right thing? I'm also having crash/boot problems that I thought were HD but maybe are GPU, but this is getting expensive and time-consuming.

rothbamberg -

In the process of trying to upgrade my Late 2009 iMac's ATI RADEON HD 4850 512MB with an AMD Radeon HD 6970M 2GB.

The 6970M I ordered didn't come with a heatsink, JUST the card. My friend helped me install it yesterday and every time I try to run a game in Windows 10 (boot camp) the computer shuts off instantly.

Based on this, does it sound like I need to get the heatsink that comes with the 2011 iMac's GPU? Or could it be something like not enough thermal paste, or a software issue?

Josh - Reply

Try that Macs Fan Control utility. In addition to being able to set the fans to come on earlier, you can also see all of the temperature readings. You could monitor the GPU heatsink temp and see if it seems to spike before the machine shuts down.

Matt G -

This worked perfectly for the mid 2010 model! There wasn't quite as much room as I thought there would be. As for slotting the card I recommend loosening the motherboard screws to give a little more wiggle room to prevent the bracket scraping the motherboard. I didn't tighten the mobo and heatsink screws in 100% as it was tweaking the board over the cables they sit on. Otherwise works great!

One suggestion is to plug the the power cord in every few steps to make sure everything is plugged in properly. Having to take the screen on and off is simple, but time consuming and annoying.

Zachary Keogh - Reply

Attempting this on a late 2009 27-inch iMac. It had a 4850 in it. I got a 6770 on it's heat sink from eBay for $60. I moved the card over to the original heatsink and reinstalled it last night. When I turn it on black screen. No chime. Major fail. Ugh.

One comment above mentions the orientation of that tiny flat ribbon cable. I have to check to see if I reinserted it upside-down. I am not sure what else I can do if that is not the problem.

I tried starting up with the LCD completely disconnected and with an external monitor connected. Anyone know if this should be possible. It would help with troubleshooting if I knew it should start up without carefully plugging those 4 cables every time I want to check. Or does having those LCD cables disconnected hose the whole machine?

Matt G - Reply

Add Comment

View Statistics:

Past 24 Hours: 165

Past 7 Days: 1,483

Past 30 Days: 6,443

All Time: 199,998