Other Uses for an AGP Slot?
SleepyHappyDoc asks: "AGP seems to be going the way of the dinosaur, but there's still a lot of slots on legacy motherboards out there. If you don't have need for the graphical advantages of AGP (say, on a headless server), what else could you use the AGP slot for? Could the advantages of AGP over PCI be leveraged in a use other than graphics cards?"
AGP has more downstream bandwidth to the slot than upstream bandwidth from the slot, whereas PCI and PCIe have the same to and from the slot.
You could use it for something like a beefy sound board.. or, something...
No, not much other than graphics output really needs that kind of bandwidth differential.
GPGPU is what you're looking for.