PowerFlex supports the hardware that is on the hypervisor HCL.

VMware vSphere 6.5U1 officially supports several GPUs for VMware Horizon 7 environments:
NVIDIA Tesla M6 / M10 / M60
NVIDIA Tesla P4 / P6 / P40 / P100
AMD FirePro S7100X / S7150 / S7150X2
Intel Iris Pro Graphics P580

More information on GPU support can be found in the online VMware Compatibility Guide.

Windows 2016 supports two graphics virtualization technologies available with Hyper-V to leverage GPU hardware:
- Discrete Device Assignment
- RemoteFX vGPU

More information is provided here: https://docs.microsoft.com/en-us/windows-server/remote/remote-desktop-services/rds-graphics-virtualization

The NVIDIA website contains a listing of GRID certified servers and the maximum number of GPUs supported inside a single server.

Server hardware vendor websites also contain more detailed information on the GPU brands and models supported.