PCIe vs PCIe

The first one is 16x electrically, but this will automatically drop down to 8x if a card is installed in the second slot The second slot is 8x electrically

NVMe Drives can use 4 PCIe lanes, which means a theoretical maximum speed of Gbps Irrespective of the form factor, NVMe

nvme slot types PCIe PCIe x 16 Slots 7 · 6 · 5 · 4 · 3 · 2 · 1 SSD Slots 5 x Ultra-Fast Storage：4*PCIe x4 slots; Efficient Overall Thermal：VRM Thermal

nvme m2 slot Two types of PCIe slot on an Asus H81M-K motherboard Various slots on a computer motherboard, from top to bottom: PCI Express x4; PCI Express x16; PCI Express