Mid 2009 Model A1278 / 2.26 or 2.53 GHz Core 2 Duo processor EMC 2326

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Do the RAM chips need to match?

Can I replace one 1GB chip with a 2GB chip with the result that I'd have a 1GB chip in one slot and a 2GB chip in the other?

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Yes you can. Be sure it's

PC3-8500 DDR3 Min. RAM Speed: 1066 MHz

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You can, but apparently when upgrading memory chips it is best to replaced them in matching pairs for the best performance, ie speed. If only 1 RAM module is replaced with the correct ship specs, the system will recognize the higher capacity.

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A matched pair of memory modules will allow interlacing the read/writes across the two banks which speeds up the read/write.


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richardwallacej will be eternally grateful.
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