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

PCIe buses can support 1x, 4x, 8x, and 16x lanes PCIe has an effective transfer speed of up to 985 MBs per lane which means there is a potential transfer

Depends on the device you're using in it It'll surely be a bottleneck if you're using a PCIe or card in a PCIe slot Simply because

m2 pcie slot 2 x16 Gen 4 Card uses PCIe , which doubles the bandwidth per lane compared to PCIe With four slots, it offers up to 256 Gbps of bandwidth per card,

m2 slot screw PCIe 4 is backwards compatible with gen 3, 2 & 1, and you will get at least the same performance from putting a drive in a slot as you