Tl;Dr: Yes, The Original Rmbp Does 4k Over Displayport And Hdmi!
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Apple MacBook Pro with Retina display (2012, 13.3-inch) review: Apple MacBook Pro with Retina display (2012, 13.3-inch) - CNET
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MacBook Pro With Retina Display Review (Mid-2012) - SlashGear
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Two External Monitors 13" MacBook Pro HDMI Dvi Adapter Setup - YouTube
