PCIe NVMe SSD on PCIe slot-Worth it?

AORUS Gen4 AIC Adaptor Key Features SSD nvme pcie 4 0 in 3 0 slot PCIe SSDs are twice as fast as PCIe SSDs But next-generation PCIe SSDs will double PCIe Gen 4 speeds nvme and m2 slot difference 2 slot directly below the CPU support the faster gen 4 NVMe cards? I'm assuming the second is gen 3 Specs say the

nvme 40 in 30 slot Im looking to upgrade my rig, but still want to use this SSD If I was to get an x570 board that has PCIe , will this nvme drive still work