I found perfect board for 3600: GIGABYTE B450M-S2H / 35 C° idle @ 0.25 Volts with ALL cores asleep with stock cooler (and yes Linux works perfectly too) : r/Amd
Best Budget Ryzen Build with Gigabyte B450M S2H Motherboard & AMD Ryzen5 3600 Processor |Insource IT - YouTube
AMD Ryzen 5 3600 GIGABYTE B450M S2H ADATA SSD GTX 1650 Segotep PRIME M Gaming PC Build 2020 - YouTube