My ( old ! ) 8800GTS 640mb can run at Ultra Superclocked speed on Water :
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Mark
Also I just noticed, is that 3dmark score with the Q6600 at 3.7? If so I think its abit low, 650/2.2 with my E6600 @ 3.4Ghz I got 12476 or something around that with my GTS 640. I notice you are in vista so add a couple hundred points but seems low still.