Thanks, I had thought about using the GPU since at Primegrid sieving Proth numbers with GPU is much faster than any CPU. The reason I didn't was that I only have a GTX 760 and a GTX 1660. The 760 is quite slow and not useful. The 1660 might be ok, but I prefer to use it for Wieferich/Wall-Sun-Sun search currently and as Happy said, it'd need to be really fast to compete against the 12 cores of the Ryzen 9 3900X.
Btw, hijack all you want, I'm glad to hear about such things.
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