MSI B450M-A PRO MAX AMD ATX Motherboard 6 PCIe slots SATA cables included 824142194447 | eBay
Colorful's new mining motherboard has 8 x PCIe x16 slots | TweakTown
Amazon.com: ASUS Prime B660M-A D4 LGA 1700(Intel 12th Gen) mATX Motherboard (PCIe 4.0, DDR4,2xM.2 Slots, 1Gb LAN, DP,2 x HDMI, Rear USB 3.2 Gen 2, Front USB 3.2 Gen 1 Type-C, Aura