Looking in Orb, at 2.4GHz, you're score of 8000 is about the norm, with your GPU.Orb Q6600@ 2.4GHz w/ 4870
@ 3.2GHz, it's a bit harder to see, but the 3 Q6600 I did see, ranged from P8528 to 13015. So, your 10k score isn't that far off. I didn't see any Q6600 hitting 20k in ORB.
Don't know what to tell you. Maybe you can find out how those folks hitting 20k are doing it.