Just spotted this @ Amdzone.com

Aaron Gordon let me know that he has released these Quake Arena optimized DLLs. There is a version for the Thunderbird or non SSE, and the Palomino/Thoroughbred SSE version of the Athlon. If anyone can run some benchmarks with these please let me know. There is also a version that works with Thunderbirds and Star Trek Voyager: Elite Force.

Download Athlon Optimized Quake Arena DLLs