Quote Originally Posted by WeStSiDePLaYa View Post
Really?

I think it might be mem related then.

Since over 1800, the mem controlled really relaxes itself, and then that is why the big performance drop.

Maybe the mem controller can't handle 4gb well.

Have you tried just one 2gb stick? or 2x1gb sticks at 1800?
Memory controller handles 8GB just fine - 8GB Results - key is to run in sync mode, keep voltages under control, and do not go above 450FSB as stated.