RTX 3080 on a PCIE board? Good or bad idea?

For instance, larger lanes such as x16 are typically used for graphics cards When using a card or component designed for PCIe in a PCIe slot

PCIe SSD Performance; EZ-Latch：PCIe x16 Slot & Connectors with Quick Release & Screwless Design; Fast Networks： LAN & Wi-Fi 6E

pcie 40 in 30 slot NVIDIA NVS 510 graphics board, Full Height Bracket , Low Profile Bracket , Four locking m-DP to DP Adapters, Four locking m-DP

pcie slot gpu PCIE x16 while the RX 5600 XT has PCIE x16 I am not sure if this is due speed issues or lack of enough power on the PCIe slot, even though the GPU