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by myelin 1994 days ago
Not super useful for you now that you have the new machine, but if your old MBP is the Mid-2014 15" model, it can drive up to two 4K displays at 60Hz, but only over DisplayPort. I have the same laptop and recently upgraded to a pair of 4K displays, and to get 60Hz I had to use mini-DP-to-DP cables rather than HDMI.