No one on earth can play this game on 'very high dx10' + max fsaa + 16AF + 1650 res. No one. Hardware doesn't exist. There are no discrepancies. It simply can't be done, SLI, quad core or not.
Bleh. Moan moan moan.
Just turn of AA, lower the res a bit, and get on with playing the game.
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I'm not even angry. I'm being so sincere right now, even though you broke my heart and killed me.