Graphic bug

[West]

So... I don't think that's a matter of GPU, but actuall Game Engine (which is id Tech 3, also knowed as Quake III Engine). It's limited and more likely desined for old GPU. It's kind of tricky to talk about that, however new GPU technology is more likely designed for newest games and they may not support old technologies, which were (for example) used in old games. Technology is going forward, but game is still the same.