I have a voodoo5 which crashes when running in dual chip mode in game. The problem occurs when 'guardband clipping' is enabled in the driver. (99% sure this is the problem). I have another working voodoo5 which does not have this problem. Both cards have the same 3d Mark score in 3dmark99 with both chips enabled, so I think the vsa100 chips are good.
I have been working with someone over at vogons.org trying to fix this problem. All the card's caps have been replaced but this didn' work. Different BIOS also did not work.
Maybe it has something to do with the card's power. Both cards run at 3.3v but the non working card goes from 3.0v to 3.3 while the good card goes from 2.8v to 3.3v. Anyway, that's all I have found out (aside from some resistance checks with the test points on the pcb).
I'm still working with the person over at vogons, maybe someone from this board knows of this problem or someone has a suggestion/tip.
Thanks! Hope English is ok, I'm Dutch and my German isn't much good.