The 2x Radeon 5570 both being passive means you have to consider the heat being stuck in the case. So you’ll have to consider the need for better ventilation with case fans, etc.
Double the graphics cards might be more of a hassle than say hunting down a quieter 5770 that vents out of the case. Perhaps this HiS card? http://www.newegg.com/Product/Product.aspx?Item=N82E16814161344
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