VRTX / Quadro P4000 / WinServ2012R2 / config for Hyper-V + RemoteFX GPU

Current setup:
Dell VRTX
M620 Poweredge
Quadro P4000
Win2012R2, utilizing Hyper-V
** Note - via pass-through, the GPU is recognized by the OS however it will not start unless I disable, then re-enable.
However, despite the Device Manager showing the GPU is running normally (and, that there are no errors logged) - nVidia Desktop Manager, DirectX, nor Hyper-V will recognize the GPU driver.

I have tested with multiple various driver versions, and with the exception of some causing a dead-lock, any driver-version will result in the same.

** Note -
alternate GPU: Quadro M4000, same result
alternate OS: Win10 Pro, same result

Firmware versioning:
CMC v3.1
M620 iDRAC v2.60.60.60 (52)
BIOS v2.7.0
** Note - I suspect the solution may be somewhere with Firmware, since the P4000 *should* be compatible on the VRTX + M620.


Desired outcome:
I would like to be able to use the high-performance from the M620 high-CPU count for CAD/CAM utilization. The P4000 seems to be the proper GPU, since my RTX/GTX GPU's aren't (apparently) compatible with the Passthrough.

I would be open to using Win10Pro native on a bare-metal blade, Hyper-V on the 2012R2 server, or I might be open to using WinServ2016 (but I'd have to buy a new license).