PCIe x1 x4 cards in x16 slot

Why would a PCIe x16 slot be limited to PCIe x1 card? pcie x4 in x16 slot Both the blue slots are PCIe x16 The difference is that the 2nd PCIe 16x is capable of wiring pcie x4 in x16 slot You can put anything smaller than the slot in just fine It's the PCI-e bracket screw that really holds things into place I'd get the newest

pcie 30 in 40 slot PCIe x16 to Dual NVMe SSD Adapter Card (Pre-order Quick view · PCIe x4 to Dual NVMe SSD Adapter Card $ USD