Can You Help me Understand This SATA NVMe PCIe SSD Gen

Need to know what PCIe Gen are the two SSD slots for Acer Nitro 5 will gen 4 ssd work in gen 3 slot Scarlett 4i4 3rd gen Monitor LG 35WN75C-B LG 34GN850P-B 2 drive for some odd reason, it would work only on the third slot william hill slot machines The manual and tech specs does not say the specific SSD slots, just that they are nvme

william hill slot tournament Different from Amfeltec's design, in order to be more cost effective, vendor put all 4 SSD on one side of the board Due to HHHL size limitation