I flashed my 8500 to 9100. Didn't make a difference performance-wise. I later flashed it back to 8500 because the 9100 BIOS was NTSC, so TV-out wasn't functioning (since I live in a PAL country). Besides, some applications that have 8500-specific functions (like comparing benchmarks in 3DMark 2001) don't work with the Radeon 9100 BIOS.
/Martin
