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

What is the difference between PCIe Gen 3 and PCIe Gen 4? will gen 4 ssd work in gen 3 slot Good idea I think the best idea is to get pcie x 4 if building today willys hot chillies slot PCIe SSDs are twice as fast as PCIe SSDs But next-generation PCIe SSDs will double PCIe Gen 4 speeds

willys hot chillies slot Gen 4 is faster than Gen 3

willy wonka slot machine locations Good idea I think the best idea is to get pcie x 4 if building today The gen 4 slot comes off your CPU while the gen 3 comes off your motherboard chipset So if you get a cpu with 20 lanes then it should work