NVME drives made for PCIe gen 4 and 5 use DRAM to get their high burst read and write rates, apart from optane devices. Most in gen 3 did as well, the 970pro be

NVME drives made for PCIe gen 4 and 5 use DRAM to get their high burst read and write rates, apart from optane devices. Most in gen 3 did as well, the 970pro being an exception.