HighPoint Rocket 1608A 8-Slot Gen 5

Can an x8 pcie gen 4 slot run 4x gen 3 nvme 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 genies 3 wishes slot Gen 3 1TB NVMe SSD for around $150-200 depending on the model This puts the price premium at about 30% between Gen 3 and Gen 4 NVMe slot

gen 4 nvme in gen 3 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