Nothing.
The QX9450 and 2 X 9800GTX will kill any game in it's way 
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CPU | Intel C2D E4400 { Intel Core2Quad Q6600 ordered }
Mobo | Asus P5S-MX SE 775
Graphics | GeForce 9800GTX+ 512mb
RAM | 2GB DDR2 Corsair { 4GB DDR2 Crucial Ballistix ordered }
Sound | Creative X-Fi Xtreme Audio
H-Phones | Creative Fatal1ty
Speakers | Logitech x-240
PSU | OCZ StealthXStream 500W
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