Okay, so I was having an issue with my Gigabyte GA-K8NXP-9 motherboard only running my Corsair XMS3200XL at 166Mhz.. Why?, because I'm using 4 sticks of DDR (yeah, I know, but it was bought over a period of time, and I can't justify the expense to re-buy 2*1024MB sticks)
I had the ram set to auto speed in the bios to start with, but it was stubbornly stuck at 166Mhz (160Mhz according to cpu-Z), even after I changed the speed over to 200Mhz manually..
What I didn't realise is that you need to press CTRL + F1 while in the main bios screen, and it opens up all the advanced memory settings, allowing you to manually set the 2-2-2-10 timings, which actually stuck this time!
Hurrah, now I'm chewing through seti units much faster, and games are running a *lot* smoother now as well
Just a chance skim-read of an old review, and my only problems with this rig are sorted