PCI Express x16 vs x8

PCI Express x16 GPUs Video Graphics Cards pcie 2 0 x16 slot Intel® Z790 LGA 1700 ATX motherboard with 18+1+2 power stages, Advanced AI PC ready, DDR5 slots, five slots with heatsinks, PCIe® NVMe® SSD slot pcie x16 expansion slot Pci express version vs version , Gen 2 vs Gen 3 Is there any real performance loss when

pcie 50 slot current PCIe Does the Intel DX79TO motherboard support x8 devices on PCIe x16 slots? 17 · PCIe x8 NIC in PCIe x16 slot