CUDA11.0 RTX2070 GTX1080 Not working

I seem to be able to get my RTX2070 to work with CUDA - using the sample DeviceQuery in Visual Studio. But never GTX1080.

Sometimes I get the error:

\CUDA error at C:\ProgramData\NVIDIA Corporation\CUDA Samples\v11.0\common\inc\helper_cuda.h:777 code=35(cudaErrorInsufficientDriver) "cudaGetDeviceCount(&device_count)

My goal was to be able to have both cards work with Tensorflow, and having lots of troubles installing from source. Is it possible to take advantage of both cards?

Currently I have:

  • disabled the onboard ‘Intel® UHD Graphics 630’ and uninstalled the Intel Control Centre
  • GTX1080Ti connected through a Razor eGPU via Thunderbold with no monitors connected to it.
  • RTX2070 is build-in and enabled.
  • The application “GeForce Experience” only ever mentions one of the two NVIDIA cards under ‘my rig’, and never both.
  • The application ‘NVIDA Control Centre’ only ever shows the RTX2070.

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OS Name: Microsoft Windows 10 Pro
OS Version: 10.0.18363 N/A Build 18363
OS Build Type: Multiprocessor Free
System Type: x64-based PC
Processor(s): 1 Processor(s) Installed.
[01]: Intel64 Family 6 Model 158 Stepping 13 GenuineIntel ~2400 Mhz
BIOS Version: INSYDE Corp. 1.07.13TMB1, 1/02/2019
±----------------------------------------------------------------------------+
| NVIDIA-SMI 432.00 Driver Version: 432.00 CUDA Version: 10.1 |
|-------------------------------±---------------------±---------------------+
| GPU Name TCC/WDDM | Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
|===============================+======================+======================|
| 0 GeForce GTX 108… WDDM | 00000000:44:00.0 Off | N/A |
| 23% 23C P8 8W / 250W | 311MiB / 11264MiB | 0% Default |
±------------------------------±---------------------±---------------------+

±----------------------------------------------------------------------------+
| Processes: GPU Memory |
| GPU PID Type Process name Usage |
|=============================================================================|
| 0 6748 C+G …oftEdge_8wekyb3d8bbwe\MicrosoftEdge.exe N/A |
| 0 7696 C+G C:\Windows\explorer.exe N/A |
| 0 8204 C+G …hell.Experiences.TextInput.InputApp.exe N/A |
| 0 8892 C+G …5n1h2txyewy\StartMenuExperienceHost.exe N/A |
| 0 9232 C+G …dows.Cortana_cw5n1h2txyewy\SearchUI.exe N/A |
| 0 12768 C+G …mmersiveControlPanel\SystemSettings.exe N/A |
| 0 14924 C+G …1.0_x64__8wekyb3d8bbwe\WinStore.App.exe N/A