S3 Accelerators?

Here’s my problem: I’m using an AMD Duron cpu, 256M RAM, an S3 Savage4 card, and Slackware Linux 8.0. I just installed Unreal Tournament, and it is extremely choppy and horrid, which many a FAQ attributed to me not having an accelerator. Problem is, I have no idea where to find one, or how to solve this problem. Suggestions would be cool.