Originally posted by: Pete
VIAN, all those cards are DX8.1 (PS1.4/VS1.x).
BigEd, you can't "upgrade" an 8500 to be able to use DX9 effects. It can be used in a PC with DX9 installed, it'll just use DX8.1 effects, at most. An 8500 isn't an extremely fast card at the moment. As for whether or not to keep it, that depends on how much money you could get for it.

A 4200 would be a faster card overall. If you can sell your 8500 for about the price of a 4200, I'd do it. I'd also aim for 128MB on a video card, but whether that much memory is nec'y really depends on whether the games you want to play can make good use of it.
In terms of performance, it's: 8500 128MB (275/275) > 8500LE/9100 (250/250) > 9000Pro (275/275) > 8500LELE/9100 (250/230 or 250/200) > 9000/9200 (250/200).
8500/9100 are both R200, which is 4x2.
9000 is RV250 , which is 4x1.
9200 is RV280, which is just an RV250 with (basically mostly for marketing purposes) support for AGP 8x.
8500/9100s can be noticably faster in certain games optimized for dual textures; otherwise, they're about even with an equivalently-clocked 9000/9200.