Took the OCZ stuff back. Got some Corsair memory in its place. CM2X1024-6400C4, which is 2 sticks at 1GB each, 800MHz DDR2. 4-4-4-12 timings. Computer runs like butter now. Smooth. Doom3 on Ultra, 8xAA, 1680x1050 resolution. Tiny bit of stutter when loading textures for a new area, but not the...