I dropped a 3700X into my Crosshair VI Hero yesterday and have been extremely impressed so far. After reading about all the horror stories about failure to POST, high idle voltage and memory issues I was fearing the worst, but I seem to have struck it lucky in every sense. No trouble booting first time and everything's working wondefully. Four sticks of B-die running at 3600MHz/CL14 so far (haven't tried anything higher yet), with an 1800MHz FCLK. I could never get even two sticks running at anything above 3466MHz with the 2700X and 2600 I've had in this board (not the first-gen chips, but I had a different memory kit back then). No problems with idle voltage - it sits around 0.9V and stays nice and cool. Was just playing some Assassin's Creed: Odyssey and the CPU was sitting in the 4250-4400MHz range at all times (mostly between 4275MHz and 4325MHz). Considering that so few people have even mentioned X370 during this launch period, and all the issues that people have encountered, it's one of the most simple and easy upgrades I've ever had. Even my 2700X gave me more trouble.