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

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Can I upgrade the RAM to 8 GB?

Hello,

I have early 2008 8,1 iMac with two 2+2GB modules. I would like to upgrade it to 4+2GB.

My questions are:

1) can I keep one of my old 2GB Kingston modules and add just one Crucial/OWC 4GB module to this configuration? Will it be stable? Or do I have to buy matched pair 4+2 made by one manufacturer (OWC, Crucial) to ensure the stability?

Is it right to insert 2GB module into the left slot and 4GB into the right slot? Or it does make no difference?

2) Of course I would prefer to upgrade to 8GB too, but let's say I buy matched Crucial pair 2x4GB (CT2KIT51264AC800) but the system doesn't recognize 8GB, is there any chance to run at least 6GB on the same configuration without further modules changing? Or will i have to throw 2nd 4GB module away and use another 2GB module instead?

Thank you very much for your help

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Your current 2GB sticks will work fine. If you've got 4+2 GB, it doesn't matter which slot each stick is in - left, right makes no difference. If you're feeling experimental, you might try swapping positions to see what happens. The biggest reason not to buy a matched set of 4GB sticks is that 4GB DDR2 PC6400 sticks are expensive, and the second one won't do you any good, unless you have another computer that needs it. Intel's memory controller for that chipset will only address 6GB (an earlier generation would only address 3GB); installing extra memory won't do anything if the CPU can't handle it. The only way to upgrade to 8GB and have it do something useful is to get a newer computer; all DDR3 systems will take 8GB.

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I have a 2009 iMac and it has 8gb of ram and if you have 2 different manufactures it will still work fine

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