ASRock Z77 Extreme4 LGA 1155 Intel Z77 HDMI or the ASRock Z77 Pro4 LGA 1155 Intel Z77 HDMI. What are the differences?
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http://www.newegg.com/Product/Product.aspx?Item=N82E16813157296
http://www.newegg.com/Product/Product.aspx?Item=N82E16813157293