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),
Thermaltake Graphite 360 Gaming PC AMD Ryzen 5 5600X RTX 3060 16GB RAM 1TB SSD for sale online | eBay