WD Black SN850X NVMe SSD vs Lexar NM790 NVMe SSD

The WD Black SN850X is the safer pick for most people. It has a DRAM cache, a proven controller, a 5-year warranty and a huge base of owner feedback, and it holds speed well on long writes. The Lexar NM790 is a DRAM-less drive that uses host memory buffer and SLC caching, so it runs cooler and draws less power, which suits laptops and PS5 use. On short bursts the two are close, but the SN850X is the more consistent drive under sustained load.

• Choose the WD Black SN850X if you want a DRAM-cached drive for a desktop, heavy game installs or video work, and you value a long track record and a 5-year warranty.
• Choose the Lexar NM790 if you are upgrading a laptop or PS5 and want low power draw and cool running over sustained-write consistency.