I just upgraded my 8800GT (512MB) to Sapphire 5850 Toxic (2GB), with Q6600 @ 3.2, 4GB Ram (only 3.5 recognized since my XP is 32 bits). Ran 3DMark06, score was 14XXX with 8800GT, and only 17XXX with 5850. I was expecting the score to be higher after the upgrade. Is the CPU holding it back?