Just a quickie, I'm currently running a pair of corsair XMS3200LL memory sticks on my nf7-s 2.0 mobo, they are 256mb each and in slots 2 and 3 to allow the DDR to kick in at 400mhz, will i have any problems adding another stick to slot one (potentially a 512mb) and will the memory still all run at 400mhz?