my friend advise me to get a 2x 512mb ddr2 667Mhz rather than 1x 1gb ddr2 667Mhz for a new pc setup i am planning to buy (Core2Duo E6300).

appreciate it if someone can explain in layman terms just how much of a performance issue dual channel memory (or lack of) it really is? does it really matter that much? in which cases? 3D games? if there is a detailed test/review site to point me to that's be great!

my plan is just to get a 1GB stick and upgrade to 2GB when memory prices come down in the future.

thanks, guys!