Hi AVAFREAK182, I have the DDR2 800 Dominator sticks with stock timings of 4-4-4-12 2T. I found that the CAS4 settings are not usable for anything over DDR2 800. I have mine running at DDR2 933 with 5-5-5-18 2T timings. With the CAS5 settings, I found they will work to about DDR2 1050 or so. DDR2 1100 or above is a no go, however, I did not try looser timings. I got slightly better framerates on 3DMark 03 with the 5 timings at 933 than the 4 timings at DDR2 740 (same CPU speed, just different memory divider).