Just finished building a Corsair Crystal 280X with EVGA RTX 3080 FTW3 Ultra on an MSI Micro-ATX and still managed to have bottom intake fans running at 40-50% : r/Corsair
CLX SET Gaming Desktop AMD Ryzen 9 5900X 32GB Memory NVIDIA GeForce RTX 3080 480GB SSD + 3TB HDD Black TGMSETRTH0B10BM - Best Buy