It seems that a lot of GPU problems revolve around specific versions of drivers. Though NVidia has their own support structure, you can often learn from information reported by others who fold.
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No errors after multiple Facore 21 projects, issue looks resolved. Thanks guys for the help figuring this out.
bruce wrote:It's probably something as simple as the order of entries in the PATH environment variable -- and likely influenced by the order of the driver installations.
The AMD/NVIDIA drivers were the most recently installed driver on both systems. As for Intel, one was using a new Intel IGP driver I installed after I removed the 750 Ti, and the other was using whatever driver Microsoft auto-installs before I put the 750 Ti in it. If we go all the way back both rigs were originally built with GPUs and the IGP was only ever temporarily used.
PhysX is not OpenCL, but, Nvidia's latest 378.72 hotfix driver had this tidbit "- Resolved PhysX being forced to CPU when "Optimize for Compute Performance" setting is OFF."
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My uneducated impression is that PnysX is an old API that's essentially not used any more. Have you found any reason to install it?
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PhysX is only used by games but this "Optimize for Compute Performance" setting also influenced OpenCL which let e.g. Boinc GPUGRID fail
That is fixed again in 378.72 Hotfix driver