Sounds like you've got a busted card, dude. I got a Leadtek 6600GT/AGP and I get 250fps in Quake 3/Linux at 1280x1024 with all the bells and whistles, and 60fps in Doom 3/Linux at "High" quality (1024x768).
Could conceivably be your motherboard or motherboard drivers, though. You might also check in the BIOS and make sure you've got AGP Fast Write and AGP 8x turned on.
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