Not sure how useful this is, but; I get 35-50 FPS plus over the cities, which was enough for messing around with subtle control inputs and landing on rooves etc, more - say around >55 FPS whilst over the water.
Most settings on high, view distance extreme, shadows on low, full preload.
GTX 1050 Ti
72GB DDR3 ECC
Two X5675 CPUs.
1TB HDD - yes, spinning rust!
That's at 1080p, 1920x1080, your typical 16:9. So you'll be a-okay I reckon. It was enough for me to blat around in the AV-8B for hours at a time, being a fool.