Hello!
I am trying to reply to you specifically, but the "reply to author" option is missing for some reason. Hope I did everything right.
Willing to help out with some testing.
My box:
Asus ROG Hero VIII motherboard
32 GB PC-3200 RAM DDR4
Skylake core i7 6700k
adaptec 5805z RAID controller
vt-d enabled.
Nvidia GTX 1070 GPU (not working because, well, Nvidia. using intel IGFX for qubes)
Double PSU config (500 w each)
Dual monitor setup.
Qubes use quirks:
using Windows 7 templated VM daily (non-seamless)
have many (>10) VMs with open GUI windows at any time.