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How about you learn to use a search engine (e.g. ninjastic.space) or even read a bit in this thread?
It took me barely a minute or two to find this post on the second page here:
Less than 37BTC, check you calculations.
Most of GPU code from RCKangaroo was used for #130.
I spent two months, about 400 RTX4090, I was lucky and solved it twice faster than expected.