The GPU has 5 ports: 2 HDMI, 2 DisplayPort and 1 DVI.
ASUS ROG Radeon RX 580 8GB GPU inside a Sonnet eGFX 550 Breakaway Box. MacBook Pro 15-inch (2016, 2.7 GHz Intel Core i7 quad-core, 16 GB RAM, discrete AMD Radeon Pro 460 4GB) on macOS High Sierra 10.13.6, running in clamshell mode (lid closed). It allows me to simultaneously have a full-screen IDE, browser windows, terminal sessions and dashboards, without a noticeable hit in performance. So far, I've been enjoying the superb screen real estate provided by 3 2560x1440 monitors powered by a RX 580 eGPU. I knew it had to be a software or configuration problem caused by the latest macOS update. If I dragged a window into the DisplayPort monitor the issue would show up, but it'd revert when dragging the same window into the HDMI monitor. The weirdest thing is that it only happened on the displays that were connected using a DisplayPort cable, but not on HDMI. Note: I forgot to take pictures of the display issues to better describe the problems I was having, and I'd rather not revert the changes just to show you how badly it looked. For example, green text would have an irritating orange "halo" around it, which made it look dirty and very hard to read, even at normal font sizes. 
The issue can be described as blurry or fuzzy text with a noticeable case of color bleed that was mostly apparent when rendering text.
#Dell u2518d software for mac update#
After the latest update to macOS 10.13.6 some, but not all, of my external monitors connected through an eGPU on High Sierra started misbehaving and having issues with subpixel anti-aliasing rendering.
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