Hey guys, I have a 4K TV hooked up to my new 2017 Mac Pro (the spec bumped one) and I can't get it to display at 3840x2160 at 60hz! It will only do 30hz at 4k, but does 60hz at 1080p. I just double checked to make sure the TV's refresh rate is fine and everything looks okay (http://www.bestbuy.ca/en-ca/product...55uh6150-light-silver-55uh6150/10414409.aspx?) I've tried a HDMI 2.0 cable to the TV, Mini Display Port to HDMI to the TV. Is there any tricks to getting this to work?