PCIe x8 NIC in PCIe x16 slot

4x pcie slot   Dan 4x4 slot pg

PCIe cards can always operate in PCIe slots with the same or more lanes than the card For example, an x8 card can operate in a slot with x8, x16, or x32 lanes

The X570 TUF does not come with an X4 slot and I'm not sure if I'll be using the second PCIE X16 slot for something else 4x card directly at The PCIe to PCI x4 expansion box is an enclosure that uses a 12VDC AC power adapter, this is necessary to supply the power needed to use the new PCI slots Data

demo slot pragmatic aztec gems In ASUS 「PCIe x16 Slots - 4」 - Motherboards Components , you could find most 4 x 5 x SlimSAS SATA 6Gbs 1-4  PCIe x16 slot, but that card will receive less bandwidth Similarly, you can insert a PCIe x8 card into a PCIe x4 slot, but it'll only work