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i scored a 10500 (i'm assuming you mean 3dmark06) on my rig before my mb died. your score doesn't seem unreasonable. admittedly the best place to look would be in futuremark's online result browser. i am sure there are much more people with your config than mine.
My old board was an xbx2 before I upgraded to the gigabyte x48 i am on now. With an e6600 @3.2 on the xbx2 i scored 13700 with my 4850CF. With the x48 board and an E8400 @3.6 I scored 18100. If you are running stock speeds on that Q6600 then your score is fine.
it will, greatly. crysis was night and day for me when i switched out the xbx2 to an x48 board. those old 975x boards just dont have the pcie bandwidth to run crossfire at peak speeds. my xbx2 and e6600 combo are now my htpc. It still is a great board.