Do I have 3rd gen or 4th gen PCIe slots?

pcie gen 4 in gen 3 slot
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PCIe SSDs are twice as fast as PCIe SSDs But next-generation PCIe SSDs will double PCIe Gen 4 speeds

PCIe has retro-compatibility, that's for the X16 slot you use for the GPU and the M possibly SATA controlled

pciex1_1 slot Zen 3 # of CPU PCIe® Native PCIe® Lanes : 24 , 20 Additional Usable PCIe Lanes from Motherboard X570 16x Gen 4 X470 2x Gen 3, 8x Gen

pcie slot meaning Zen 3 # of CPU PCIe® Native PCIe® Lanes : 24 , 20 Additional Usable PCIe Lanes from Motherboard X570 16x Gen 4 X470 2x Gen 3, 8x Gen