I have an ATI X1900 PCIe graphics card that came from a Power Mac G5. I'm wondering if this card is compatible with anything besides a Mac G5- specifically, is it usable in a Windows machine that has PCIe? Also, would it work on an Intel Mac, such as a Mac Pro? I'm not entirely sure, but I think this was the card that came preinstalled in the system direct from Apple.
If it helps, I believe the model number is 100435854, but I'm not entirely sure. The card doesn't have the kind of P/N S/N sticker you would expect. But I was able to find the card on Newegg, and it had that model number. So it's not guaranteed, but it might be the same. It looks identical to the one pictured on Newegg.
Also- by yes, do you mean it will work with Windows, Intel Macs, or both?