Motherboards with a good number of PCIe slots

pcie slot width   Dan pcie x4 in x16 slot

; Motherboard via one of: PCIe ×4; PCIe ×4; PCIe ×4; Serial ATA · USB · Intel · Phison · Realtek · Samsung · Silicon Motion · SK Hynix

Generally speaking, there are five physical sizes of PCIe cards: x1, x4, x8, x16, and x32 (FYI, PCIe x32 does exist with a maximum of 32 lanes, From a bandwidth perspective, 8-lane PCIe has a bandwidth of around 63 Gbps which is sufficient for 4 channels x 12Gbps SDI

concrete slot drain The third slot is physically an x16 slot, but only 4 lanes are connected Hence “negotiable link width x4, x1”  A PCIe x4 slot has a physical length of approximately 39mm and has a single notch on the connector, similar to a PCIe x1 slot PCIe x4 devices are compatible