PCI compatibility of old PCI chipsets and "newer" GPUs?

[eccerr0r]

I could have sworn my PCI ATI Radeon 9250 was working, but when I stuck it in an old 82430TX P5 board, it didn't work... is this expected?

I suppose I'll need to test it in a AGP board to see if it works or not, but this struck me as weird.

[eccerr0r]

hmm. nope, he's dead, Jim.
Or at least they don't like the BX board either.

[stj]

there are several revisions of pci like there are of agp.
no, i dont know the details

one other thing, be wary of any card salvaged from a powerPC based mac,
they could run the pci at double-speed!

[eccerr0r]

Yeah there was a pci 2.2 and 2.1 that I recall that was an issue where the pci2.2 required 3v3 on the bus, the older 2.1 all had LDOs on 5v to power 3v3 devices or something like that. But I think these were all 2.1 or older, I don't recall ever getting many 2.2 cards.