What is PCI Express? Do PCIe lanes, slots, and versions matter?

What is PCI Express? Do PCIe lanes, slots, and versions matter? pcie 3 slot The third slot is typically a PCI-e x4 connection This limitation on add-in card support means that users who want a pcie 4 m2 in pcie 3 slot An x4 PCIe device has a theoretical max transfer rate of MBsec according to wiki

pcie 4 m2 in pcie 3 slot OSS PCIe x8 Gen3 expansion backplane ✓ 8x PCIe x8 slots✓ 1x PCIe x16 target slot ✓ OSS-PCIe3-BP-452-ATX ➤ Get your inquiry!

pciex1_1 slot I believe both slots are generation 3 because chapter 1 of the manual indicates that HP only offered Gen 3 NVMe SSD's in the model series and I believe both slots are generation 3 because chapter 1 of the manual indicates that HP only offered Gen 3 NVMe SSD's in the model series and