NVIDIA GRID vGPU - Rocky start, any good experiences/help?

Greetings,

We are attempting to configure dual Tesla M10 GPU cards in our VxRail E570F servers (Dell 14G 2U box) to be used for a Citrix Xendesktop VDI cluster. We are finding that we cannot get ESXi to properly allocate memory to these cards with the default MMIO setting = 56T. Changing the setting to 12T or 512G per this Dell article causes the server to purple screen a few minutes after full boot.

This is using the latest available VIB from NVIDIA on ESXi 6.5u3c.

https://www.dell.com/support/article/ht/en/htdhs1/sln308065/dell-poweredge-14g-esxi-returns-failed-to-initialize-nvml-unknown-error-with-nvidia-gpu?lang=en

NVIDIA support portal is down so I'm attempting to get knowledge elsewhere on this tech.

Thanks for any advice.