MacBook Pro 15" Core 2 Duo Models A1226...

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Installed 6 GB RAM now machine is super slow

2.2 GHz A1226 machine: Last night I installed the 4GB SODIMM in place of a 2 GB one to upgrade to 6GB RAM which they say is allowable for my machine. I had 2x2GB for a long time and it worked well but I just installed a new drive a few months back so I wanted to max out the RAM. Immediately upon installing and the initial boot up, the machine was smoking fast feeling and life was good. The 6GB of RAM showed up as there in the About This Mac menu. I then put the machine to sleep and went to bed. The next day my old lady started complaining about the computer being too slow to use so I rebooted again and it took about 20 minutes to boot up. It's so slow now that it's useless. I powered down, took the battery out and reinstalled the old RAM but the problem persists. Any suggestions as to what to do next? I'd really like to use the 4GB + 2GB arrangement as this 4GB stick wasn't cheap. Thanks in advance.

Answered! View the answer I have this problem too

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have you tried to get back to 2+2 and checked if the speed is up again? Maybe it's not related to the RAM but the harddisk playing up!

by Spikey2

Hi Spikey, if you read more carefully you will see that I stated "reinstalled the old RAM but the problem persists". Problem is still in play...

by Irrenarzt

i'm looking forward for upgrade my mbp a1226 to 6gb ram too. So i would like to ask if your problem have solved yet ? What was the cause ? Is the ram is a culprit ? thanks a lot!

by firmmelter

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It sound's like your RAM is unbalanced, if you don't have equal RAM in both slots, then you can cause kernel panics and all kinds of crazy and unwanted stuff.

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If this was the case then why does the problem persist when I go back to the 2x2GB matched pair I've been running for over 2 years without issue?

by Irrenarzt

I really respect rab's comments usually, but there is no need to have matched RAM in this computer.

by colleenthompson

I understand that usually people often consider the unbalanced ram thing an urban legend often, however the OP's problem seemed similar to the effects usually described. However, in light of re-looking at the other issues at hand, my scenario of unbalanced ram seems unlikely to be the problem.

by rab777hp

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Most Helpful Answer

It's odd that it was working but then it stopped.

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As you should be able to see here, Apple recommend 4GB but 6GB is possible. This means you're not going to get any support from Apple themselves.

I would suggest checking the RAM is in the ports correctly, checking About this Mac to see if it still recognises it's there. Try running an Apple Hardware Test, specifically an Extended Test.

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Nice screenshot!

by Kyle Wiens

Thanks, the app is [mactracker.dreamhosters.com|MacTracker]

by QEII Student IT

Hi QEII. ran the extended hardware test last night as suggested. Took forever but no problems detected. I then proceeded to clear the caches, repaired disk permissions, ran fsck in single user mode, reset PRAM all without luck and the issue still persists. I then reinstalled the 6GB RAM and did the extended Apple Hardware test, no problems detected. Any other suggestionsare welcomed. I live a LONG way from the nearest Apple store so I would hate to have to make that trek.

by Irrenarzt

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It could very likely be a coincidence having nothing to do with the RAM upgrade. Here's something simple and free: download SMART Utility from versiontracker.com. Demo mode is free for a limited time. See if it warns you of imminent hard drive failure.

I know you said the drive is newish, but I've had brand new drives fail with hundreds of bad sectors (blocks) right out of the box. And extreme slowness is one symptom of bad blocks.

A further thought added later: have you tried booting to an external to see if it's slow running under another system? You need to rule out 1. hard drive failure (use SMART Utility for that) and 2. software (booting to another system would do that.)

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'What's your free space overhead on the HD?

More RAM means you need more free space for VRAM.

If you're running lots of RAM the system may still be trying to use VRAM that's not available, and that could slow it down.

Are you certain that you're actually accessing all 6GB of RAM? I can put 4GB in my Macbook but the OS only access 3GB.

N.

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I think the idea is counterproductive in parts. More ream means less need to swap, won't it?

by Spikey2

Hi Machead, so I'm a dunce and have been answering questions in the wrong area. -2 rep points because of it. My bad. I actually have a 640 GB drive in there with 400 GB free. I should be OK.

by Irrenarzt

Spikey2 - Well yes and no. [quote]More RAM means less need to swap,[/quote] True but there still needs to be a swapfile created, and space for it to be created. If there isn't that could lead to slowdown. N

by machead3

I wonder if you partitioned the HD if the problem would still be there? FWIW DU, DFA is really thin on doing a verify or repair disks, TechTool or Diskwarrior often find sort order errors on disks passed by DU, DFA. N.

by machead3

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not sure about the kernel panics - but sounds the explanation for the asylums doctor. Take 2 valium and have a nap.

I bet it's the harddisk crapping itself!

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Th disc is relatively new and has been problem free thus far. It's a WD Scorpio Blue 640GB model and I have had great luck with WD thus far both at work and home. I'd be surprised this is the issue.

by Irrenarzt

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I'v got 6gb too and is grate. work's fine and fast. Model a1226 with vram128 4mb cache level.

I suggest koybe seller at ebay..., Regards Catalin from italy

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Irrenarzt will be eternally grateful.

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