Hp z640 NVMe PCIe Crucial card on PCIe expansion car

PCIe Gen 4 vs Gen 3: Do you need to spend extra on SSDs? gen 4 nvme in gen 3 slot I was wondering if I could use Nvme gen4 on a gen 3 board ? I think my board only has one slot, so I may want to upgrade genie 168 slot 5 Place that in PCIe slot 4 which is a PCIe generation 3 slot with x8 electrical lanes The card is PCIe3 x4 Note that the

genie slot slot SATA is the slowest: SATA isn't as fast as an SSD But it is still very fast, and faster than all Gen 4 and many Gen 5 SSDs