Model A1225 / Mid 2007 and Early 2008 / 2.4, 2.8, or 3.06 GHz Core 2 Duo processor

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Problems upgrading the systems memory

I have a 24" iMac, early 2008 with two 1GB and want to replace them with two 2GB. Can you tell me a brand and model I can use for the new RAM modules? Thank you! (Best Buy sold me the wrong ones--too long to fit the slots.)

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You may want to review this Apple TN: iMac: Memory specifications and upgrades

Your system uses DDR2-800Mhz RAM. Here's one source: iMac Memory For either iMac7,2 or iMac8,1 models

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I just upgraded my early 2008 20" iMac to 6GB. I bought the upgrade package (2GB + 4GB) from Other World Computing (OWC). Seems to work fine. Just make sure each memory chip is in the correct memory slot. Otherwise, you will hear a continuous 3 beeps.

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And which slots are the correct ones?

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When the screen is facing down to install the RAM (set it down on a towel or something soft ), the 4GB chip is inserted on the left, and the 2GB chip on the right. Use the pull tabs to remove the existing chips, and seat the chips in the same way (on mine, there is also a diagram on the bottom of the iMac stand).

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Sadly, you can't just throw the memory any which way as you'll not take advantage interleaving. You need to place the same sized modules within the same bank (matched pair).

To see what you have now open your systems hardware report: About This Mac >System Report > Memory. Do you have your memory correctly placed?

Bank 0/DIMM0 and Bank0/DIMM1 should have the same sized modules.

Then Bank 1/DIMM0 and Bank1/DIMM1 should have the other set of memory.

If you look carefully the logic board is marked with the Bank & DIMM slot ID.

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That's a very good point Dan. Although I'm doubtful it will work, I am going to attempt to install 4x4GB to take advantage of interleaving.

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Doug Berdie will be eternally grateful.
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