Here's the overclocked PIII-S pushing a PCI Radeon 9250 to the limit. System specs are listed in the post above.
This one was built by ATI themselves and has a 128-bit memory bus, according to GPU-Z. Default core speed is 240MHz, but I gave it a slight bump to 250MHz, effectively turning it into a Radeon 9200. Yes, the 9200 was slightly faster than the 9250. This was ATI's marketing team at their best. 🙄
Interestingly, the 9250 managed to edge out the 6800GT in Car Chase - High Detail. This test appears to prefer ATI's drivers over nVidia's; the Radeon 9800 Pro was also able to beat the 6800GT by quite a bit, scoring 46.5 fps. The 6800GT was able to greatly outperform the 9250 in all of the other tests, as expected.
The overclocked PCI bus in this machine may also be helping out. The driver used was Catalyst 5.6.

Ten Gigahertz
5 Groovy GHz: Ryzen 9 5900X | GTX 1080 Ti | 64GB DDR4-3600 | 2TB NVMe, 8TB HDD | Win 10
5 Troll GHz: AMD FX-8350 | Radeon R9 Fury | 16GB DDR3-1866 | 500GB SSD, 2TB HDD | Win 8.1