I'm running a Mac mini i7 2018 6 Core and my brother is running an iMac Pro 10 Core, both on 10.14.4 Mojave. Our monitors is the Sony 49" 4k x720e, plugged into the TB3 port. Other than the Mac itself, we have identical cabling, adaptors. He's able to get HiDPI 3840 x 2160 resolution but I'm not able to get more than 3360 x 1890 (HiDPI). Is this due to the graphics card, mine being a UHD 630 and his is a Vega 56? Even with SwitchResX, I'm not able to get past 3360 x 1890 (HiDPI). I've tried this method https://comsysto.github.io/Display-...or-with-HiDPI-Support-For-Scaled-Resolutions/ using Display Product/Vendor ID but still a no go for me. Any advice would be appreciated. Thanks.