I tried to test the increase we get from only Async Compute as we know that the path only works with TSAA and no AA.
First I checked my fps with no AA enabled in OGL, then with FXAA. Then I switched to Vulkan and redid the tests. No AA and FXAA (which disables async path). I also took the results from TSAA.
Well, it turns out that I'm actually losing performance when Async Compute path is enabled, at least with Fury X. I redid the tests 3 times and I always got the same results. I restarted the game every time I changed a AA or rendering path.
Test system: 3930K @ 4.5Ghz, 16GB 2133mhz DDR3, Fury X, latest drivers.
DOOM settings: 2560x1600p, ULTRA settings.
First place: Advanced Research Complex, after train stops at the station.
OpenGL:
NoAA: 54fps
FXAA: 53fps
TSAA: 52fps
Vulkan:
NoAA: 71fps
FXAA: 74fps
TSAA: 69fps
Second place: Argent D'Nur, at mission start. (forgot to take pic)
OpenGL:
NoAA: 82fps
FXAA: 81fps
TSAA: 79fps
Vulkan:
NoAA: 102fps
FXAA: 105fps
TSAA: 98fps
Yep, results are not skewed and Vulkan with FXAA (no Async Compute) is actually faster than Vulkan without AA and Async Compute enabled