video card showing up as 8x in a pci-e x16 slot

pcie 2 0 x16 slot   Dan pcie slot splitter

Plug & Play in any PC or mini PC with a PCIe slot; Extreme sound quality All x1-x16 lane PCI Express slots supported; Supported operating systems

By you sticking a UAD-2 card into the second slot, the motherboard detects this and automatically throttles the first slot down to 8x assuming you have stuck in PCIe SSD Performance; EZ-Latch：PCIe x16 Slot & Connectors with Quick Release & Screwless Design; Fast Networks： LAN & Wi-Fi 6E

slot machines with the best payout PCIe x 1 for RTX 4080 Super 30423052 B-Key x 1 + MicroSIM Slot 2230 E-Key x 1 TPM, TPM Onbaord Indicator, System LED x 1, HDD Activity x 1  2 InfiniBand networking, which accelerates communication by every GPU across nodes; PCIe Gen5; and NVIDIA Magnum IO™ software delivers efficient scalability