Agreed. You'd be better off replacing the motherboard. Something by SiS is cheap and good. You can use your existing video card or sell it to get something better.
I'd recommend going to an SiS motherboard with integrated video (if money's tight) and sell the i810 mobo. Maybe CPU as well if you want to move to AMD and get a cheap, awesome Duron. Sell the PCI video card since you'll get a little premium for being a Geforce PCI and get an AGP card when you can.
Something much, much faster like a GF3 Ti200 or Radeon 8500 for around $100.
Then you've been upgraded across the board without breaking the bank.