Nvidia gtx 460's problem (SLI)

I've tested a couple things in multiple games. Battlefield 3 one of the main ones, Also Batman Arkham City. Battlefield 3 being preset to High Settings which my single gtx 460 handles a lot better than my SLI setup. I get more consistent FPS with a single gtx 460 than I would with them in SLI. When running the 460's in SLI my fps dips below 30fps sometimes.

Also noticed when running evga (on screen display) sometimes my cards sit at 30% usage. And whenever they feel like it they bump up to 70% plus and give me very nice frame rate.

Very confused. Help.

Motherboard - ASUS M4N98TD EVO AM3
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131636

CPU - AMD 1100T BE (Overclocked 3.7ghz)
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103913R

Ram - G Skill 8gb 1333ghz
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231426

Video Cards - Gtx 460's 768mb Superclocked (In SLI)

PSU - Corsair 750tx
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139006
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  1. Sounds like some sort of bottleneck somewhere. Not sure where though.
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