HP ProDesk 400 G4 Desktop Mini Business PC Specifications

PCIe x1 slots have only one PCIe lane Despite having only one PCIe lane, PCIe x1 slots are useful for various lower-power PCIe peripheral cards

So, while even a single x1 PCI Express slot is far more capable than a set of PCI slots, USB or Firewire ports, it doesn't necessarily mean that

pcie slot height Les slots PCIe sont les interfaces par lesquelles les périphériques PCIe sont connectés à une carte mère Les emplacements existent en plusieurs tailles, x1

pcie 20 x1 slot A PCIe x1 slot has only one PCIe lane Although there is only one PCIe lane, the PCIe x1 slot can be used for various low-power PCIe