iMac Intel 27". EMC 2309 (Late 2009, Core 2 Duo 3.06 or 3.33 GHz), EMC 2374 (Late 2009, Core i5 2.66 GHz or Core i7 2.8 GHz)

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Terrible Geekbench 3 results should I replace my i7-860 processor?

My aged but serviceable iMac is running slow. I installed an ssd recently (clean install of Yosemite) hoping to improve things... (it worked so well on my old MBP).

I recently installed Geekbench 3 and my scores are about half of other people's iMacs of identical spec.

The numbers are particularly bad in integer and floating point results.

Wondering if there's anything I can do?

Could I buy a new i7-860 processor like this one: http://www.cpumedics.com/bx80605i7860.ht...

would that solve the problem do you think?

Could it be anything else?

Ram?

Whatever?

Hopefully it's not software - very recent clean install of Yosemite on an SSD should be OK, right?

I would very much prefer to pay in the order of USD150 rather than shelling for a new mac!

Answered! View the answer I have this problem too

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Can you give us the specs of your SSD. It's possible it's not the correct unit for your system

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It's a 1TB Samsung 850 EVO.

I put an 1TB 840 in my MBP and it has become a most useful machine again. Snappy, quick to load apps. Especially great in parallels because I can only put 8GB in that MBP)

Also in the iMac is a 4TB WDC WD4003FZEX-00Z4SA0

I use the 4TB drive to store documents, and the SSD for system and applications.

The SSD is in place of the DVD using iFixit's drive caddy.

and the 4TB is in the place of the old system drive.

Pretty sure math functions are handled by the i7-860, right? there's no math co-processor like in the old days is there?

Geek bench does not seem to benchmark the drive performance. Perhaps I should try to do that to put aside the SSD as being part of the problem?

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No there is no co-processor thats back in 386 time ;-}

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I used b***k m***c to test the drives. The SSD in the iMac (253MB/s Write, 267MB/s Read) works at almost the same speed as the one in my MBP. The 4TB conventional hard drive is a bit slower, but not bad (143MB/s Write, 142MB/s Read).

I think the drives are OK. my understanding is geek bench does not really test drives anyway. It is the woeful geek bench scores I wonder if I can fix somehow? I get scores near half of what others have uploaded on very similar iMacs.

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sorry for the delay, but iFixit's spam detector is a bit over zealous about the words b1ack mag1c (popular drive benchmark software and apparently something else too?)

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2 Answers

Chosen Solution

Replace the processor. I made a guide.

iMac 27" late 2009 Intel i7 processor replacement (EMC 2374)

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You'll need to allow people to see it. You have it marked private

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Yes I worked that out. I got confused by iFixit's privacy icon. iFixit shows an open padlock icon if your post is marked private. Semantically this is back to front. Open padlock for private? Surely it should be closed for private, open for public?

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Most Helpful Answer

I would start with the basics here:

Have you checked your systems firmware? Here's the Apple T/N to follow: About EFI and SMC firmware updates for Intel-based Mac computers.

How full is your SSD? You should leave about 1/4 to 1/3 of free space, more if you have a smaller SSD.

How much RAM do you have? Yosemite needs at least 4GB of RAM, I like my systems with 8GB.

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EFI and SMC up to date.

SSD 78% free (787.6 gig free) (it's a 1TB samsung 850 EVO)

16GB RAM

Also I read that repairing permissions can help - it made a bit of a difference, but not very much. (not really sure why this should be required on a new clean install of the OS, but hey, whatever it takes, right?)

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The optical drives SATA port is only SATA II (3.0 Gb/s). I would try a new SATA cable for the drive. Also you should check with Samsung's web site making sure your SSD's firmware is unto date. Lastly did you enable TRIM using the terminal command that was just added in the latest Yosemite release?

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EFI & SMC are up to date. I used HD benchmark software to test drives. The scores are about what you'd expect I think. No I did not do a terminal trim command, but I heard some worrying discussion on the effectiveness of activating it. Geek bench does not really test drive performance so I don't think that can be the cause of the bad scores. (50% of others with very similar hardware.)

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We just finished updating about 100 systems (mostly MacBook Pro's) between the ones that had a SSD from before and the new ones we have added running the current cut of Yosemite with the new OS-X TRIM service enabled we have not encountered any problems. Apple put a disclaimer use at your own risk. But frankly, I just think its a CTA statement we had tested quite a few systems before the big push to update the field. I haven't seen any issues.

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Sadly, I don't have a system as old as yours so I can't see what I get using the same tests.

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