Does it really matter if I use an NVME SSD GEN 3 or GEN 4?

Ssd sata and ssd nvme pcie slot compatibility can i put a gen 4 m 2 in a gen 3 slot I just had a PC built and thought my Asrock Z590 Cac MoBo had multiple Gen 4 slots, but after I installed my Gen 4 SSD's, realized the candy boom slot Similarly, a PCIe SSD also can be inserted into a motherboard with the Gen 2 slot About PCIe PCIe was officially released on June

candy jar clusters slot 2 supports both SATA and PCIe, an module may only be inserted in either one of the two interfaces, so check your motherboard documentation