Unfortunately it's not working. When I suspend the task and restart it works for a short while and then progress stops. Same for GFN-17 (mega).
Apparently there's some problem, according to stderr.txt:
geneferocl 3.3.3-2 (Windows/OpenCL/32-bit)
Copyright 2001-2018, Yves Gallot
Copyright 2009, Mark Rodenkirch, David Underbakke
Copyright 2010-2012, Shoichiro Yamada, Ken Brazier
Copyright 2011-2014, Michael Goetz, Ronald Schneider
Copyright 2011-2018, Iain Bethune
Genefer is free source code, under the MIT license.
Running on platform 'NVIDIA CUDA', device 'GeForce GTX 1660', vendor 'NVIDIA Corporation', version 'OpenCL 1.2 CUDA' and driver '456.38'.
22 computeUnits @ 1785MHz, memSize=6144MB, cacheSize=704kB, cacheLineSize=128B, localMemSize=48kB, maxWorkGroupSize=1024.
Supported transform implementations: ocl ocl2 ocl3 ocl4 ocl5
Command line: projects/www.primegrid.com/geneferocl_windows_3.3.3-2.exe -boinc -q 78306998^131072+1
Normal priority change succeeded.
Checking available transform implementations...
OCL transform is past its b limit.
OCL3 transform is past its b limit.
OCL4 transform is past its b limit.
OCL5 transform is past its b limit.
Using OCL2 transform
Initialization complete (0.884 seconds).
Estimated time for 78306998^131072+1 is 0:07:59
maxErr exceeded for 78306998^131072+1, 1.0000 > 0.4500
Errors occurred for all available transform implementations
Waiting 10 minutes before attempting to continue from last checkpoint...
According to this post it happens when the GPU overheats. It's usually at 78-79 °C, rarely up to 80 °C. I'm surprised that already causes problems, it's a new card. But I'll try and use MSI Afterburner.
Update: I use Afterburner to reduce clock and core by 2 MHz and limited temperature to 75 °C. It never went above 68 °C but still the task failed. I have no idea by how much frequencies should be reduced, is 2 MHz very little? I still these problems are strange, is something wrong with the card?
1281979 * 2^485014 + 1 is prime ... no further hits up to: n = 5,700,000