At the moment I have 2*512 PC6400 geil sticks. I've been hearing about a lot of issues with geil lately, which is suprising as my last board had 2*1gb DDR3200 which ran fine. Anyway, I want to add 2*512 of corsair PC6400 - I'm 99% sure it'll work but I want to make sure (as I'm at 430FSB). My main concern is the timings of the ram - whether this will cause any problems.