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According to Apple's website, the latest version of the rMBP will be able to drive a 3840 x 2160 display at 30Hz via HDMI.

• RyanZAG 13y ago
  30Hz sounds like a 'No' to me.
  • quaint- 13y ago
    Why? It's not like you're going to play graphically intensive games with it. 30Hz sounds just fine for many types of content, like text (and even videos).