no point in buying pc4000 being as it will be reduced to 2700 automatically... perhaps you should ditch teh 2 256mb pc 2700 sticks... or not buy the kingston... also your computer will not use all the kingston RAMS speed no matter what, being as pc 3200 is the max utilized by default unless you are overclocking... what processor do you have? all of this matters, i would sugest buying a 2*256mb kit of pc3200... prolly be less than the kingston, and would perform better most likely.