Using very fast GPU should direct all work to the GPU.
Try running from the command-line with -d common -d opencl, and share the results here.
The log file is placed in C:\Users\<userName>\AppData\Local\Microsoft\Windows\INetCache\darktable, but that’s a hidden folder, I think, so you’ll have to adjust Explorer’s settings, or type/paste the path (with your user name in it) directly into Explorer to open it (see I can't get Darktable to work anymore - #4 by kofa).
Regarding darktable resources: they are set to default, but your machine has decent specs, you could try large instead.
If you have the ‘Microsoft OpenCL Compatibility’ (Kit or Pack? I don’t remember) installed, try removing it (though it usually leads to immediate crashes, not processing errors). Ah, found it: Darktable not opening - #6 by kofa.