Nvidia A2000 in SFF - Precision 3450 PCIe x4 slot

Help understanding PCIe 16x8x16x8x 4x pcie slot PCIe UD Slot X：PCIe x16 slot with 10X strength for graphics card; EZ-Latch Click： heatsinks with screwless design; EZ-Latch Plus： slots with 4x4 slot PCIe x1: These are the smallest PCIe slots, used for almost any other cards like average network adapters and USB expansion cards PCIe x4:

4x4 slot pg My first motherboard runs the 3x full size slots in a PCIE 4x configuration, with the single slot at 1x configuration How can I change