So I used a PCI riser to have also the A4000 installed. On my Windows 10 box Rhino 7 detects all three cards no problem:
_SystemInfo
Rhino 7 SR14 2021-12-14 (Rhino 7, 7.14.21348.13001, Git hash:master @ 5ab502b613f84488d00228948505c6f28ebfe598)
License type: Commercial, build 2021-12-14
License details: Cloud Zoo
Windows 10.0.19044 SR0.0 or greater (Physical RAM: 32Gb)
Computer platform: DESKTOP
Standard graphics configuration.
Primary display and OpenGL: NVIDIA RTX A6000 (NVidia) Memory: 48GB, Driver date: 9-13-2021 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 472.12
> Accelerated graphics device with 4 adapter port(s)
- Windows Main Display attached to adapter port #0
- Secondary monitor attached to adapter port #1
Secondary graphics devices.
NVIDIA RTX A4000 (NVidia) Memory: 16GB, Driver date: 9-13-2021 (M-D-Y).
> Accelerated graphics device with 4 adapter port(s)
- There are no monitors attached to this device!
NVIDIA RTX A5000 (NVidia) Memory: 24GB, Driver date: 9-13-2021 (M-D-Y).
> Accelerated graphics device with 4 adapter port(s)
- There are no monitors attached to this device!
Intel(R) HD Graphics 630 (Intel) Memory: 1GB, Driver date: 9-5-2020 (M-D-Y).
> Integrated graphics device with 3 adapter port(s)
- Secondary monitor attached to adapter port #0
OpenGL Settings
Safe mode: Off
Use accelerated hardware modes: On
Redraw scene when viewports are exposed: On
Graphics level being used: OpenGL 4.6 (primary GPU’s maximum)
Anti-alias mode: 4x
Mip Map Filtering: Linear
Anisotropic Filtering Mode: High
Vendor Name: NVIDIA Corporation
Render version: 4.6
Shading Language: 4.60 NVIDIA
Driver Date: 9-13-2021
Driver Version: 30.0.14.7212
Maximum Texture size: 32768 x 32768
Z-Buffer depth: 24 bits
Maximum Viewport size: 32768 x 32768
Total Video Memory: 49140 MB
Rhino plugins that do not ship with Rhino
D:\Dev\Rhino\rhino-developer-samples\cpp\x64\Debug\SampleRealtimeRenderer.rhp “SampleRealtimeRenderer”
C:\Program Files\Bongo 3.0 (64-bit)\Rhino6\Bongo.30.rhp “Bongo 3.0”
C:\Users\Nathan\AppData\Roaming\McNeel\Rhinoceros\7.0\Plug-ins\Crayon (43f0446f-00a7-4ff3-864f-0d3af5e47e2b)\1.0.7751.36916\Crayon.rhp “Crayon” 1.0.0.0
C:\Program Files\Doliwa Workshop\Rhino Nature\Rhino Nature.rhp “Rhino Nature” 1.0.0.19879
C:\Users\Nathan\AppData\Roaming\McNeel\Rhinoceros\packages\7.0\IntelDenoiser\0.6.4\IntelDenoiser.Windows.rhp “IntelDenoiser.Windows” 0.6.4.0
C:\Users\Nathan\AppData\Roaming\McNeel\Rhinoceros\packages\7.0\NVIDIADenoiser\0.4.3\NVIDIADenoiser.Windows.rhp “NVIDIADenoiser.Windows” 0.4.3.0
C:\Users\Nathan\AppData\Roaming\McNeel\Rhinoceros\packages\7.0\SubstanceImporter\2.0.2\Substance.Win.rhp “SubstanceImporter” 2.0.2.0
Rhino plugins that ship with Rhino
C:\Program Files\Rhino 7\Plug-ins\Commands.rhp “Commands” 7.14.21348.13001
C:\Program Files\Rhino 7\Plug-ins\WebBrowser.rhp “WebBrowser”
C:\Program Files\Rhino 7\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino 7\Plug-ins\RhinoScript.rhp “RhinoScript”
C:\Program Files\Rhino 7\Plug-ins\IdleProcessor.rhp “IdleProcessor”
C:\Program Files\Rhino 7\Plug-ins\RhinoRenderCycles.rhp “Rhino Render” 7.14.21348.13001
C:\Program Files\Rhino 7\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 7.14.21348.13001
C:\Program Files\Rhino 7\Plug-ins\rdk_ui.rhp “Renderer Development Kit UI”
C:\Program Files\Rhino 7\Plug-ins\NamedSnapshots.rhp “Snapshots”
C:\Program Files\Rhino 7\Plug-ins\Alerter.rhp “Alerter”
C:\Program Files\Rhino 7\Plug-ins\RhinoCycles.rhp “RhinoCycles” 7.14.21348.13001
C:\Program Files\Rhino 7\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 7.14.21348.13001
C:\Program Files\Rhino 7\Plug-ins\3dxrhino.rhp “3Dconnexion 3D Mouse”
C:\Program Files\Rhino 7\Plug-ins\Displacement.rhp “Displacement”
Unfortunately I can’t test Windows 11 as mentioned, but I’ll ask around if other devs in our team can reproduce the problem.