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

What is the difference between PCIe Gen 3 and PCIe Gen 4? pcie 4 0 gpu in 3 0 slot Like USB, PCIe is forward compatible This means that a device which requires PCIe will work in a PCIe or PCIe slot Slot Size Lane Width pcie 40 in 30 slot Yes, you can use a PCIe graphics card in a PCIe slot PCIe slots are backward compatible with PCIe cards, meaning they can still work together

pcie 40 gpu in 30 slot After a quick Google search, I found this article which explains that: a PCIe x16 slot can theoretically hit approximately 32 gigabytes