3dMark06 Decreasing Score?

[Hawnted]

Ok I ran 3DMark when I first put my system together and got 11100. I then ran it when I OCed the proc to 3.6 and got 12250. Ok, I got it stable then overclocked the Vid card, and ran 3Dmark06 and scored 11080. I ran it again, 11130, and again 11190. WTF, how does overclocking the vid card lower my score? I used RivaTuner 2.05. Here is the system:

Vista X64
Q6600 G0 L726A
8800gtx
OCZ GameXstream 700w
EVGA 680i P30
D-Tek Fuzion CPU Block
MCW60 GPU block
PA120.3 Rad
Swiftech MCP655 pump
Raptor 150g
2 750 g Seagate Baracudas
Soundblaster XFi Platinum
OCZ DDR2 PC8500 Sli Ready Edition
Stacker 830 Case

[Jigsaw]

I am no expert but I am going to take a shot at this anyway... As you increase the memory clocks on your graphics cards, the timings will change at certain preordained frequencies. Try lowering the memory clocks maybe 50MHz at a time until you see a greater increase in your score. Another option would be to return your cards to default frequencies and use RviaTuner to find the memory timings and copy them to Note Pad, overclock your card again and paste the original timings into RivaTuner again.