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I'm referring to the 2015 Macbook Pro, 15-inch, with the AMD Radeon R9 M370X with 2GB GDDR5 memory. Can this drive two Ultra HD monitors (3840 x 2160) at 60FPS each? If so, would you be able to simultaneously use the built-in display?

To be clear, I'm referring to SST (single-stream transport) monitors, not MST (multi-stream transport).

You'd have to plug each monitor into a Thunderbolt port, since HDMI supports only 30FPS. Are both Thunderbolt ports on different Thunderbolt buses, or the same? In the latter case, there may not be enough bandwidth.

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According to this document https://support.apple.com/en-us/HT204154 The MacBook Pro (15-inch and 17-inch, Early 2011) and later have Thunderbolt2 and can handle two thunderbolt displays (2560x1440).

According to this document https://support.apple.com/en-us/HT202856 The MacBook Pro (Retina, 15-inch, Late 2013 and later) can handle one MST 4K display at 60Hz.

You can run one 4K monitor off of the Thunderbolt display at 60z and a second off HDMI at 30Hz. the two thunderbolt ports are connected. Once you try to connect a second 4K monitor to the other port, you will go over the bandwidth and the second monitor will go dark.

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  • I clarified the question to say that I'm talking about SST monitors, not MST. Do you have a source for "you will go over bandwidth"? Or is it from personal experience? – Vaddadi Kartick Jul 21 '15 at 1:46
  • 4K@60Hz is required up to 16Gbps. Thunderbolt2 is comprised of PCIe2.0 and displayport1.2 wrapped into one. The bandwidth of Thunderbolts 2 is 20Gbps. Math... it's a killer. – ZOMGnerd Jul 21 '15 at 11:23
  • Right, I meant to ask: is there a source to back up your claim that both ports are on the same Thunderbolt bus? Thanks for your help. – Vaddadi Kartick Jul 23 '15 at 13:50
  • There is only one thunderbolt controller for the MacBook Pro – ZOMGnerd Jul 23 '15 at 13:54
  • And one controller means only one bus? – Vaddadi Kartick Jul 24 '15 at 13:01

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