I have the same board and the same problem. I just flashed to the latest BIOS (3-5-01) from Iwill with no change. I was hoping that would fix it, but the description included only "fixed CPU frequency error" and that does not appear to be our problem. The problem we're having is that the FSB to PCI multiplier isn't changing when we switch the jumper (AGP, ISA, DMA as well). I can't find any option to adjust it in the BIOS. I can only tweak the fsb above 133, and that just raises the PCI, etc. even higher.
What are you using to determine your PCI and AGP speeds? I'm pretty new to this, so can only assume that Sis Sandra 2001 is reporting correctly. Anyone out there know if Sandra could be wrong...I hope? Any other options to test these bus speeds?
Anyway, I'm going to e-mail Iwill USA and see if I can get a response. Until further notice, I'll have to stick with 100FSB for my 850 t-bird. To bad, it seems happy enough at 133 fsb, but I won't risk the rest of my new system. My real concern is future upgradability when fast "c" processors get into my price range.
noko, is your KK266 non-raid having this problem?
BW
the more I learn, the less I'm sure I know...