My system has a 1080 with 8GB. Used VRam seen in XP, is 3.5-3.9 in current situation. PC has 32GB.
Besides that i have stopped using SMP, as it totally kills my framerate. Without SMP i have 60, and as soon as i enable SMP it drops to 20. That is with 2 x volumetric on. If i turn the first volumetric off, it is flyable again, but i then see the ground skyclear, when the weather is actually Fog and visability 0.1 km. Not realistic.
But XE116 is also not usable on my system, so just using default clouds now.