A motherboard with 4 sticks of ram, a lot of capacitors and resistors, two m.2 slots, 2 pcie x16 slots
Motherboard PCI-E X16 Slot 1 To 4 Expansion Card Btc Mining Machine GPU Extend Artifact Graphics Card Adapter With 6PIN Power - AliExpress
PCIe Gen 4 vs. Gen 3 Slots, Speeds
NeweggBusiness - GIGABYTE X299-WU8 LGA 2066 Intel X299 Motherboard with 7 PCIe x16 Slots and Dual Intel Server LAN
Intel C246 Server Motherboard-4 DIMMs DDR4 support ECC, 2 PCIe x16 slots | eBay
ASUS Pro WS W680-ACE IPMI Intel W680 LGA 1700 ATX workstation motherboard, dual PCIe 5.0x16 slot, DDR5, ECC memory and XMP support, dual Intel 2.5 Gb Lan, 3xPCIe 4.0 M.2 slots, USB
ASUS Launches WS C246 PRO: 4 PCIe 3.0 x16, Two M.2, Optional SAS RAID
ASUS PRO WS W790E-SAGE SE Intel W790 (LGA 4677) CEB motherboard, PCIe 5.0, 7 PCIe 5.0 x16 slots,M.2 PCIe 4.0 slots, 12+1+1 DrMOS, DDR5 R-DIMM, Dual 10G BMC LAN, LAN Server-grade Remote
Amazon.com: ASUS Pro WS W790 SAGE SE Intel LGA 4677 CEB Motherboard,PCIe 5.0, 7 xPCIe 5.0 x16 Slots,DDR5 R-DIMM, 2x10G BMC LAN, LAN Server-Grade Remote Management,Front and Rear USB 3.2 Gen 2x2