Nothing. No amount of benchmarking causes the Pro's fans to go to max. They'll turn on, for sure, but never to anything close to the speed the Intel 13" Pros reach.
My M1 Mac mini, running 100% CPU for now multiple weeks, is completely inaudible. My 2012 Intel Mac mini, running near zero "active" software, runs louder. (It's a Plex server, and Plex server idle runs hotter than the M1 at full load.)