Bearing in mind though that I've got no other problems with anything: the card cuts through Far Cry for example. It's probably just my CPU bottlenecking my GPU. YES, Doom 3 is (so I understand) more GPU-orientated than CPU, but nevertheless, surely with a superior processor I'd get better performance?
EDIT: agex000, now come on, since when did John Carmack & co. start to produce a BAD game engine?... Never, imho.
AMD X2 4400+ Toledo 1MB/Asus A8N-SLI Deluxe/2GB Kingston HyperX/SLI Gigabyte 7800 GTX 256MB/Creative SB Audigy 2 ZS Plat w/ Creative Inspire 6.1 speakers /180GB Hitachi PATA/19\" AG Neovo F-419 LCD/OCZ PowerStream 600W PSU/WinXP Home SP2