Hey everyone ^_^ Right, so i've upgraded my PC recently and it's running everything nicely, the only problem I have is a degree of stuttering in games like F.E.A.R and BF2142, Framerates and other things are all good but I know my RAM is letting the system down. My spec is: AMD Athlon 64 3700+ HIS X1900XT 256GDDR3 1 gig of branded Ram (might be Crucial, but not sure, it begins with C) DDR400 450W PSU by Jeantech Asrock SATA 2 Mobo Now, i've gone and ordered some high quality Ballistix Ram from Crucial.com (2x 512 DDR400) but my worry is that my old Ram will stop it from running to it's full potential because of different CAS latencies and timings etc. So my question is, what would be the benefits of getting 4x 512 Ballistix over using the 2 lower quality RAM and the 2 Ballistix ones together? will I notice much difference at all or is there no difference? I was only wondering since running different modules together tends to make the higher ones scale down to the slower ones, but i'm not sure if this applys if they are both the same speed (DDR 400) Thanks a lot everyone. Matty.