did you have PCI or AGP card? AFAIK all FX5000 from nvidia are based on AGP. btw the pc only showing 4x AGP for the card since your mobo only support up to 4x even if your card able to support up to 8x. also your mobo won't be able to use 8800GT since your mobo does not have PCI-E x16 slot.
can i make games run a little beather anyways cause i play wow lich king with 50 fps normal and wow cataclysm with about 35 fps but in battleground drops to 15 anyway to fix that?