gimps

http://www.mersenne.org/ CPU installation guide - https://hardforum.com/threads/gimps-installation-guide.1813722/ GPU installation guide - https://hardforum.com/threads/dc-vault-2.1620596/page-3#post-1037748416 Before PrimeGrid, we had GIMPS. They use the old school stress test tool called...

The largest known prime number has been discovered by a FedEx employee from Tennessee. He did this running the GIMPS distributed computing client on an Intel Core i5-6600. The new prime is 23M digits long and is 1M digits larger than the previous prime. That's one heck of a LONG number...