1x 1GB = Single Channel,
2x 1GB = Dual Channel,
1x 1GB, 1x 2GB = Single Channel,
2x 2GB = Dual Channel.
3GB would work well, although not ideal - dual channel doubles memory access speeds, however for 1GB the size rather than bandwidth will be the limiting factor.
Whats the CPU? Pointless putting 4GB in if it's got a slow CPU...
3GB by 1x1GB and 1x2GB is what i'm being "forced" to run atm on my netbook as the 1GB is soldered and while it's not ideal obviously it is still much much faster than just the single 1GB stick.
And there wont be any sort of compatibility issues as long as you buy the right stuff.
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