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With the same cpu but with 512mb ram on a GT at 400/1100 I think I get 56fps at 1280 x 1024 High Quality 4xAA so I would guess yours may be a little low.
Yeah, it's still low, I have a 2.4C @ 2.91 (it was a lame duck :-p) with 6800GT at 370/1.0 (stock BFG OC), 1gb RAM, and I get around 51 fps at 1280x1024, High quality, 4xAA.
Edit: Just realized it's a standard 6800, so you're good to go.