List of Motherboards with 5 PCI-Express x16 Slots - Pangoly
Impact of PCI-E Speed on Gaming Performance | Puget Systems
Amazon.com: ASUS AMD AM4 Pro WS X570-Ace ATX Workstation Motherboard with 3 PCIe 4.0 X16, Dual Realtek and Intel Gigabit LAN, DDR4 ECC Memory Support, Dual M.2, U.2, and Control Center :