This makes me wonder if NovaBench is useful in a real world context. I ran several tests with diff video cards and achieved scores of over 1000, maybe 1100, on a Q8300 (I forget which exact Q8000) with 8GB DDR2 and a 5750, 640GB WD Black.
My video scores were slightly higher than yours, usually a little over 500 but certainly always under 600. Still, you're only beating my overall scores by less than 200. Doesn't that seem wrong? Shouldn't your i7 blow away my old lower end C2Q?
For the video cards I tested a 4870x2, 5750 1GB, and 9800GT 512MB. My 5750 was always the winner, with the 4870x2 not far behind but the 9800GT was substantially lower. As far as I know the 4870x2 cannot be fully utilized, it runs as a single GPU, otherwise I imagine it would definitely beat the 5750.