That seems to be correct. Nice score, and that will increase the further you push your CPU clock
.Take a look at your "physics" and "combined" scores and compare them to ~TB~ who has the same CPU but at 4.4Ghz. Physics is ran by the CPU but combined is both GPU and CPU. You won't achieve the same combined score as ~TB~ (2xGTX 580) but it will be higher than you have now with an overclock.
Also ~TB~ has his 580s overclocked so take that into consideration as well.
~TB~ could you disable SLI and run the performance setting with one GTX 580 please and post here for comparison if possible?. It would help rampin and be easy to find for him.

. Also nice 11.5k score.