It's pretty much a lost cause - the closest you'll get is the AGP FireGL X1/Z1 but the drivers for them won't work on any new Linux, since they're years-old now (and never actually worked on anything besides Red Hat to start with). The last public NVidia Linux driver is the same way - I believe the highest card they supported was the AGP Quadro FX line, but there are special stability issues (probably bus-related, although I don't know) with Quadro FX cards in HP workstations so most people had to fall back to lower-end cards.
While I'm talking R300, though, the open-source R300 drivers will work on a recent Linux distribution and provide 3D to a very, very, very limited (slow and buggy) extent. I would assume they would work with a PCI card although you'd probably have to goof around with KMS and early-stage boot stuff to get the system up (as an off-the-shelf PCI R300 won't have an EFI BIOS).
Most people nowadays run their Linux IA-64s headless, judging from the Linux-IA64 mailing list. Proprietary video drivers strike again!
<>
