ARCTIC Liquid Freezer II 360 360mm CPU Water Cooler for AMD AM4/5 Ryzen Rev. 7 4895213701983 | eBay
Didn't know Ryzen 5 3600 could be this hot, 78c max temps on OCCT Power benchmark (stock settings: CPB On, No OC applied) even on 360 AIO and good paste (noctua nth1),