Originally posted by: nefariouscaine
There are a bunch of factors - generally speaking less memory puts less stress on the motherboards memory controller - this is way over simplified and doesn't always play a huge role
My current rig is running 4x1 at DDR2-1120 at 560fsb at CAS 4-5-4-15 - but not always did my boards like to do this - and no matter what I cannot get my board to like DDR2-1200 at 500fsb - even though i can run 1200 at a lower fsb with a divider
If you wanna be sure pick up some of that mushkin or the g.skills - 2x2 makes more sense in the long run - its not that expensive - will leave you open slots and give you some spare memory with your old stuff