Hi Robin,
Yes, changing the registry helped and it works great on two monitors.
See before & after the reg change.
Before - with 30 VM sessions:
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 410.68 Driver Version: 410.68 CUDA Version: N/A |
|-------------------------------+----------------------+----------------------+
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
|===============================+======================+======================|
| 0 Tesla M10 On | 00000000:3D:00.0 Off | N/A |
| N/A 51C P0 31W / 53W | 8142MiB / 8191MiB | 79% Default |
+-------------------------------+----------------------+----------------------+
| 1 Tesla M10 On | 00000000:3E:00.0 Off | N/A |
| N/A 46C P0 30W / 53W | 8142MiB / 8191MiB | 77% Default |
+-------------------------------+----------------------+----------------------+
| 2 Tesla M10 On | 00000000:3F:00.0 Off | N/A |
| N/A 28C P0 17W / 53W | 8142MiB / 8191MiB | 29% Default |
+-------------------------------+----------------------+----------------------+
| 3 Tesla M10 On | 00000000:40:00.0 Off | N/A |
| N/A 40C P0 30W / 53W | 8142MiB / 8191MiB | 73% Default |
+-------------------------------+----------------------+----------------------+
| 4 Tesla M10 On | 00000000:DA:00.0 Off | N/A |
| N/A 52C P0 33W / 53W | 8142MiB / 8191MiB | 94% Default |
+-------------------------------+----------------------+----------------------+
| 5 Tesla M10 On | 00000000:DB:00.0 Off | N/A |
| N/A 44C P0 19W / 53W | 5094MiB / 8191MiB | 41% Default |
+-------------------------------+----------------------+----------------------+
| 6 Tesla M10 On | 00000000:DC:00.0 Off | N/A |
| N/A 41C P0 35W / 53W | 6110MiB / 8191MiB | 100% Default |
+-------------------------------+----------------------+----------------------+
| 7 Tesla M10 On | 00000000:DD:00.0 Off | N/A |
| N/A 43C P0 25W / 53W | 6110MiB / 8191MiB | 57% Default |
+-------------------------------+----------------------+----------------------+
After - with 50 VM sessions:
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 410.91 Driver Version: 410.91 CUDA Version: N/A |
|-------------------------------+----------------------+----------------------+
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
|===============================+======================+======================|
| 0 Tesla M10 On | 00000000:3D:00.0 Off | N/A |
| N/A 29C P8 10W / 53W | 8142MiB / 8191MiB | 2% Default |
+-------------------------------+----------------------+----------------------+
| 1 Tesla M10 On | 00000000:3E:00.0 Off | N/A |
| N/A 30C P8 10W / 53W | 8142MiB / 8191MiB | 18% Default |
+-------------------------------+----------------------+----------------------+
| 2 Tesla M10 On | 00000000:3F:00.0 Off | N/A |
| N/A 27C P0 20W / 53W | 8142MiB / 8191MiB | 5% Default |
+-------------------------------+----------------------+----------------------+
| 3 Tesla M10 On | 00000000:40:00.0 Off | N/A |
| N/A 27C P8 11W / 53W | 8142MiB / 8191MiB | 34% Default |
+-------------------------------+----------------------+----------------------+
| 4 Tesla M10 On | 00000000:DA:00.0 Off | N/A |
| N/A 29C P8 10W / 53W | 8142MiB / 8191MiB | 4% Default |
+-------------------------------+----------------------+----------------------+
| 5 Tesla M10 On | 00000000:DB:00.0 Off | N/A |
| N/A 35C P0 19W / 53W | 7126MiB / 8191MiB | 3% Default |
+-------------------------------+----------------------+----------------------+
| 6 Tesla M10 On | 00000000:DC:00.0 Off | N/A |
| N/A 31C P0 19W / 53W | 7126MiB / 8191MiB | 1% Default |
+-------------------------------+----------------------+----------------------+
| 7 Tesla M10 On | 00000000:DD:00.0 Off | N/A |
| N/A 29C P8 10W / 53W | 7126MiB / 8191MiB | 0% Default |
+-------------------------------+----------------------+----------------------+