Hp z640 NVMe PCIe Crucial card on PCIe expansion car

Hp z640 NVMe PCIe Crucial card on PCIe expansion car gen 4 nvme in gen 3 slot Gen 4 is faster than Gen 3 genies secret slot BUT you go buy the off brand no name cheaper 1TB Gen 4 NVME for lets say, 70$ (6-7K read

genies secret slot Yes, PCIe is both forwards and backwards compatible For example, this gen 4 NVMe SSD will work in a gen 3 PCIe slot, and a gen 3 NVMe SSD would also work

genie jackpots slot BUT you go buy the off brand no name cheaper 1TB Gen 4 NVME for lets say, 70$ (6-7K read Looking at Amazon there is PCIe Gen 3 NVME and PCIe Gen 4 NVME for sale I don't see this even mentioned on the Wikipedia page for NVM Express