I get the memory timings "greyed-out" in cpu-z also Higgins. This happens when I set use MemSet to set my CAS timings. The correct timings will show in cpu-z until I reboot, then the timings disappear in both cpu-z and MemSet...but I know the selected timings have been activated. Not sure why they are greyed-out?

Unfortunately, I must use MemSet, because if I disable the automatic "ram timings by speed" bios setting, even at default settings and stock 266FSB, the system will not post. But it is completely stable at 450FSB x 7 with stock voltages, using MemSet set to 4-4-4-12 @ 1.9v.