![]() I suspect that Apple made a design choice with the third Thunderbolt 2 bus, such that it’s also connected to the two Gigabit Ethernet ports and HDMI output. By using a spare Mini-DisplayPort to HDMI Cable you can connect a monitor directly to the third Thunderbolt bus and it lights up the display, also at 30Hz. Yes, it is HDMI 1.4 but that’s not the only way you can connect a monitor. I’d read that you can’t use a third monitor unless you connect it to the HDMI port, and it’s only HDMI 1.4 therefore it can only output 30Hz at 4K. The third monitor is an interesting quandry. Hence I have the two 60Hz monitors connected via Mini-DisplayPort to DisplayPort cables, one to each Bus. The Mac Pro 2013 has three Thunderbolt 2 buses and due to the bandwidth restrictions for 4K UHD 60Hz displays, you can only fully drive one 60Hz display per Thunderbolt 2 bus. ![]() I wrote previously about why I invested in a Mac Pro and I realised I didn’t describe how I’d connected everything up, in case anyone cares.
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