It is now possible for programs to do a precise and reliable selection of the GPU by first issuing a query to OpenCL with the clGetDeviceInfo() function with the param_name parameter set to cl_khr_pci_bus_info. This extension is available starting from OpenCL 3.0.7
References: - https://github.com/KhronosGroup/OpenCL-Registry/blob/master/specs/3.0-unified/pdf/OpenCL_Ext.pdf Chapter 39. PCI Bus Information Query - https://www.khronos.org/registry/OpenCL/sdk/1.0/docs/man/xhtml/clGetDeviceInfo.html - https://www.khronos.org/registry/OpenCL/sdk/1.0/docs/man/xhtml/clGetDeviceIDs.html - https://www.khronos.org/registry/OpenCL/sdk/1.0/docs/man/xhtml/clGetPlatformIDs.html
