[G4] Video cards

[Jim]

Hi all, I'm a new subscriber and this is my first post.
   I have a G4, DP MDD 1.25Ghz with 1 gig ram.
I have both bootable systems on my computer, OS 9 and OS X, 10.2.8.

I am wanting to upgrade my video card to increase my frame rates for 
gaming purposes.  I've gone round and round trying to figure out which 
card is better and which card will work on both OS 9 and OS X.

The video card I have now is the NVDA,GeForce4Ti 4600.

I would appreciate any suggestions and help that I can get to solve this 
problem.
Thanks