Lexar NM790 vs WD_BLACK SN850X at every capacity: prices, $/TB, speeds, endurance. Which to buy in July 2026 — full family comparison.
This page compares the Lexar NM790 and WD_BLACK SN850X product families across all capacities we track. Per-capacity pricing changes the verdict more often than specs do, so start with the capacity table and then check the spec differences below.
On paper, the Lexar NM790 family leads on sequential read (7,400 vs 7,300 MB/s). In practice, both saturate typical consumer workloads — the speed gap matters mainly for sustained multi-GB transfers.
Per-terabyte economics favor the Lexar NM790: $127.50/TB at its best capacity, against $133.75/TB for the WD_BLACK SN850X. If budget drives the decision, the Lexar NM790 is the default.
Architecturally, the WD_BLACK SN850X family uses a dedicated DRAM cache while the Lexar NM790 relies on HMB (Host Memory Buffer). For OS and gaming duty they behave identically; sustained random writes favor DRAM.
| Capacity | Lexar NM790 | WD_BLACK SN850X | |
|---|---|---|---|
| 1 TB | — | $220 · $220.00/TB | |
| 2 TB | $310 · $155.00/TB | $348 · $174.00/TB | Full comparison → |
| 4 TB | $510 · $127.50/TB | $535 · $133.75/TB | Full comparison → |
| 8 TB | — | $1300 · $162.50/TB |