For NVIDIA graphics cards, you can have two working as one (SLI). For a .NET desktop application, I need to be able to check that SLI is enabled. Is this possible?
In .NET 3.5 C#, is there a way to detect if NVIDIA SLI mode is active
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That should be possible.
According to the nVidia docs, you can query this via NVCPL.DLL (liked to documentation).
The call to be used is
NvCplGetDataInt()
(page 67), with the argumentNVCPL_API_NUMBER_OF_SLI_GPUS
orNVCPL_API_SLI_MULTI_GPU_RENDERING_MODE
you should obtain the information required.In oder to access this information, you'll need P/Invoke. If it is OK to statistically link
NVCPL.DLL
you just have to create the correct import (static external method) and you're fine. Otherwise, you can also choose theLoadLibrary
andGetEntryPoint
way and use theMarshal
class to create an instance of a delegate (declared with the correct arguments) which represents the function to be called.Edit: The following snippet may get you started (I don't have a nVidia card though, so that's completely untested and on your own risk ;) ):