What exactly does the spec “PCIe x16 slot ” mean?

4x pcie slot   Dan 4x4 slot

Also generally you don't get that many PCI-E lines from CPU to make 4x PCI-E to operate even at x8 and NVMe take even more lines For new

Upstream port: PCIe x8 Edge Finger · Downstream port: Two Internal PCIe Cable Port · PCI Express Switch: 16-Lane, 5-Port PCIe Gen 3  Slot 2, PCI Express x16 ; Slot 3, Slot not available on this board ; Slot 4, Slot not available on this board ; Slot 5, PCI Express x8 in a

mmk slot game PCIe slot, with some computers having multiple PCI Express slots 4x, 8x, and 16x slot configurations, increasing the maximum potential 4x PCIe card Close inspection reveal the head of the PCIe connector match the PCIe specification in term of voltage I supposed they used