USB PCIe card in x16 slot?

Are UAD-2 cards supported on PCIe x4 or x16 slots? pcle x16 slot A slot can provide multiple lanes, from 1 lane in the smallest slot to up to 16 in the largest slots Using two graphics cards normally entails pcle x1 slot List of Motherboards with 4 PCI-Express x16 Slots: ASUS Pro WS TRX50-SAGE WIFI, GIGABYTE A620M C, GIGABYTE B650M C V2, ASUS Prime B760M-A AX, GIGABYTE B760M

pcle slot Hi, i have a tiny question on PCIe lanes My Mobo has 2 PCIe x16 slots The manual says that both of these ports operare in x16 modes,