It seems as PCI-Express 4.0 NVMe solid state drives have come into their own and are more mainstream we still haven't seen a DRAM-less solution.  Well that is changing today with the ADATA XPG ATOM 50, which combines the DRAM-less InnoGrit IG5220 4-channel Gen4 x4 controller with Micron 176-layer TLC NAND flash memory running at 1600 MT/s.  Without the a DRAM chip you still get SLC caching using Host Memory Buffer (HMB) which uses your system's DRAM rather than requiring a dedicated DRAM chip.  With this configuration the drive offers sequential read and write speeds of 5000 MB/s and 4500 MB/s respectively.  Is this the new Gen4 drive you need? Read on as we take a look!