Im sorry but I could not find your CPU specs...do you have a dual core?
Please let me know what kind you have
He has an Intel Core i7 860. I agree with the other posters, You have a CPU bottleneck for a few reasons
1) 2.8Ghz isn't really enough to let the HD5970 shine
2) 3DMark06 runs at 1280x1024, at this resolution your CPU can't keep up with your GPU
3) 3DMark06 is heavily CPU dependent, and is not really an accurate tool to measure system performance.
Like others have suggested try some games out.