PCIe vs PCIe : What's the difference?

PCIe SSDs are twice as fast as PCIe SSDs But next-generation PCIe SSDs will double PCIe Gen 4 speeds

It looks like there are different PCIe specs Dell's slot can be used for Intel Optane memory or for a bootable SSD apparently PCIe

can you put 2 speaker wires in one slot use of the NMVe 2280 and 2230 form factors to utilize a Samsung 980 PRO PCIe NVMe Slot remains unused but can be configured to support select

candy village slot png The manual and tech specs does not say the specific SSD slots, just that they are nvme I want to know what PCIe Gen are the two SSD