I'm not sure where the best place was to put this thread; seeing as I built the computer, I suppose it'll go here. Feel free to move it there's a more appropriate board for it to live in.
So, recently I've noticed that whenever I've started up my PC there's been a few green pixels which move around where there should be black pixels, and tend to crowd around objects on screen. I turned on my PC to take an example video and... well... you can see SOMETHING's not right.
My thoughts are either a failing graphics card or PSU. I haven't done any overclocking, and my PSU was able to handle two graphics cards at once (I had my old 9800GTX+ in there for PhysX earlier), so I'm thinking it's more likely a graphics card problem. I don't think it's a cable or monitor problem because 99% of the time it's fine.
Once again I just want to thank you guys for the advice and benchmarks. Tom's Hardware forums and the people in it really are awesome.
I've sent XFX a support ticket which they should hopefully reply to sometime today. For the record, the card (and the rest of the components) is about 6 months old. Not that it really makes its failure any more acceptable, but just adding some more information to the melting pot.