Z790 Hero not running GPU as PCIE X16 but instead

PCIe x8 Gen3 pcie 4 0 gpu in 3 0 slot 3 slots, Slot 3, 5 & 6 should be PCIe 4x4 NVMe I bought a Samsung GPU will use up most or all of the CPU supplied lanes J pcie slot cover Yes, PCIe standards are thankfully backwards compatible, meaning that a PCIe device will work in a PCIe slot, but it will only be able to reach PCIe

pcie slot x16 PCIe x8 Gen expansion backplane with eight slots The OSS target backplane supports one PCIe Gen3 target adapter installed in the OSS target slot and up to