PCIe : What's New and Why It Matters - How-To Geek

PCIe can generally work in PCIe slots, though only at the lower performance level of the older version This means that instead of taking advantage of

Like USB, PCIe is forward compatible This means that a device which requires PCIe will work in a PCIe or PCIe slot Slot Size Lane Width

can i run a pcie 40 in 30 slot It's worth noting that the PCIe standard is backwards compatible, so you can, for instance, use a PCI-e graphics card in a PCI-e slot without issue,

can you run ddr4 in a ddr5 slot It won't work well but it will work So, what I need is a NVMe x4 passive adapter card, which will plug the into a normal PCIe x1 slot, and