I added an Nvidia A400 low profile GPU to my proxmox server and passed it through to a Windows VM in order to use it for light accelerated graphics purposes (AutoCAD, etc) but I end up getting worse performance using it that when ACAD was using software rendering. I enabled GPU passthrough using PECU, and checked that the correct kernel parameters, blacklisted modules, etc were set.
Did I choose the wrong card? Am I missing some configuration somewhere?