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The Vega GPU is about equal to the GTX 1080 if I am talking about the correct one as you mentioned. The performance would also depend a lot on the CPU as some settings in X-Plane require heavy CPU Usage. Compatibility should be great with X-Plane 11 as long as you're up to MINIMUM requirements followed here:
Tested XP11 on a brand new iMac Pro with 32 Gb of RAM (Demo Mode at Seattle with default B737):
– 1920 x 1080 px in full screen mode– Max settings but antialias at Min: 70+ fps– With Max settings with Stormy Weather and anti-alias Max: ± 20 fps
The Reflection Detail is not fluid starting 4/5, and at 5/5 it seems to be showing only 5 frames per second.
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