OCWorkbench has posted more AMD K8 benchmarks
Here is another commonly used benchmark Quake 3 Demo 001 (1024x768x32) that you can use to gauge the performance of AMD K8 3100. The benchmark is done using Tyan Radeon 9700Pro with 1 x 512M Corsair XMS3500C2. Drivers used Catalyst 3.2 (7.84).Check it out