What is the difference between r10 and r11.5 open gl test? I ran my work computer to see how it compares to your thuban scores. My computer is a w3540 2.93xeon w/ firegl 7750 and 4gb ram. My results were:
R10
8299 open gl
4414 1x cpu
15859 4x cpu
55 seconds

R11.5
16.26 fps opengl
4.18 pts cpu

So, in r10 my card is better than a 4870x2 but in 11.5 its much worse.

Looks like thuban is a pretty nice chip even compared to the i7 xeons. Especially considering I could buy 2x thuban 1090t for the price of the single w3540 in my workstation.