3dMark 2001 isn't only having problems with Sis735 boards, the board I referred to is a MSI K7T Pro2 RU based on the KT266A chipset, and being Via it shouldn't be considered "too small a market-share" to be worth making the prog work with.
This is the mobo of my main rig, and the reason I got it was because I thought my K7S5A was bad (which it turned out it wasn't, that darn DragonOrb had killed my 1.4 T-Bird) and that I wanted to oc and not have to solder to rise the vcore to get the best oc.
I have a ECS K7S5A system though, 1Ghz Duron with 256Mb ddr. Haven't got it hooked up right now though, so I cannot check to see if I have the same problem. And no, I haven't tried the oc bios so I don't know if it'll run 150fsb stable.