I have an Athlon XP 2000 with an Abit KT7-Raid Mobo I am getting ready for an upgrade, but right now my memory stick is flaky it is causing crashes and will run errors under mem test and ram tester program. the memory in it now is a 512 mb stick of pc 133. My question is can i go ahead an purchase 400 MHZ memory and run in that MOBO at 266MHX until I upgrade the MOBO, and Proc I specifically am aiming for Athlon 64 by feb. Thanks for the advice.