You should have an open PCI slot. Do what Mister Elf says.
Yeah, those G4s were LOUD. The G5 XServe was whisper quiet in comparison. I haven't heard the Intel one yet. Hopefully they're not as loud as the Dells, those are louder than the G4 XServe. They sound like jets taking off... then crashing. I swear, you can hear people crying in agonizing pain. Or it could just be the whining fans. Anyway, Dells are really loud.