pcie x4 slot ✓ 5-Port SATA III 6Gbps PCIe x4 Host Card

pcie x4 slot
PCIe x1: The smallest slot, typically used for sound cards, network cards, and other low-bandwidth devices · PCIe x4: Offers more bandwidth thanpcie x4 slot List of Motherboards with 2 PCI-Express x4 Slots: ASUS ROG MAXIMUS Z790 APEX ENCORE, NZXT N7-Z39XT-W1, NZXT N7 Z370, ASUS TUF X299 Mark 1, ASUS Prime X299-A

pcie x4 slotThe PCIe x4 Gen2 backplane supports a PCIe Gen2 target cable adapter installed in the OSS target slot and one or more PCIe x16 expansion cards

pcie x4 slot PCIe 6612 has x1 Form Factor and maximum bandwidth for x1 configuration is 250MBs It doesn't change if you put x1 card in x2, x4, or x16