I would go with the 9700 pro

I understand that ATI had graphics compatibility problems at this time?

Nvidia, ATI, PowerVR, S3, SiS, etc : They all had compatibility problems of some kind.

It really depends on what you are going to play. The 9700 pro is pretty stable in windows 98 and at much faster than the fx 5600, which is the next best choice.

Also should point out 3d Prophet 4000 XT is a PowerVR, not an ATI 😀 If you want the best image quality on certain old 3d games eternally stuck in 16-bit color, there's that. ATI/Nvidia dither on the texturing which can accumulate, while PowerVR does it in post on a true color buffer.

oh ok thank you,
The 3D prophet 4000XT will be a good solution to mount a win98Se machine intended for older games and compatible DOS?

Regarding ATI, reading several posts I thought I understood that the cards were to be avoided for compatibility reasonstable fog and palletized textures?
And if I take ATI what would be the best version of drivers for compatibility?

Regarding games, it will be a platform to play the full potential of the win98Se environment and an alternative as a second pc for early xp games.
I'm thinking of building another setup from an ASUS P2B for early win98Se and DOS games