What score are you getting in 06'???
Edit- I see only 21k. I don't understand that AT ALL. I had a Phenom II quad at 3.9ghz and a gts250 get 17k. When I had my 4870 X2 it laughed at 06', something has got to be wrong. 06' does not use PhysX, perhaps take the 8800gt out and see what happens. Perhaps whatever you are using to allow PhysX with an ATI card is killing your ATI's performance. The SM2 score is horrible, SM3 score is only the same at my gtx460. I also only had my I7 at 4.2ghz instead of 4.5ghz like I had with the 9800GX2.
I really think with a 5970 you should be around the same score as mine even with the Phenom II at 3.8ghz.
Also, you have a C3 stepping, I can't believe yours overclocks that poorly. 1.48v at only 3.8ghz??? I have a C3 555 and I can run 3.8ghz on 1.35 voltage and 4.2ghz at 1.50!