What is the difference between PCIe Gen 3 and PCIe Gen 4?

A x1 PCIe card can be detected in pcie x16 slot? pcie 1x slot This PCIe x1 to PCIe x16 Slot Extension adapter provides enhanced compatibility between motherboards and a variety of PCI-Express expansion cards, allowing you pcie slot dimensions Can I use a 1x PCIe slot? No Nvidia rendering GPUs require a PCI-e 16x slot running at 8x or better to function For number crunching (ie:

pcie 4 nvme in pcie 3 slot Expansion slots: 1x PCIe Gen5 x16, 1x PCIe x1, 1x E-Key Video ports: 1x HDMI ; 1x DP ; 1x eDP USB: 2x USB Gen2 Type-C