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I've got an 8600GTS and my highest ever 3dmark06 score was 5934 with the same rig in my signature, but with my card OC'd to 754/1126 (from 650/1008) just for the purpose of running the benchmark. Otherwise I've always played games like Oblivion at stock clocks... Guess I'd be seeing a significant difference...
You should see getting on twice that score with your 8800GT, with the spec in your sig and with the GT at stock!