Quote:
Originally Posted by sclitheroe
The only thing to keep in mind is that you want to retain dual-channel memory access. This means that if your motherboard only has two DIMM slots, you want to add a pair of 2 gig DIMMs, not 1x1 and 1x2. Sucks to not have access to the extra memory, but dual channel access is a good way to get a 10-15% performance boost out of your machine compared to single channel.
RAM is cheap, and any of the 32 bit operating systems run fine with 3.x gigs of RAM available to them, so don't fret too much over wasting some of it.
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That's not entirely true, some Intel chipsets provide support for a mode called "flex mode" which allows for partial dual channel even with mismatched dimms.
http://www.intel.com/support/motherb.../cs-011965.htm