Verdict

These are comparable SSDs. The LNM790X004T-RNNNU is rated for the most write endurance, so it lasts longest in a NAS that sees steady writes; for light use any is fine and price decides.

LNM790X004T-RNNNU
Lexar NM790 · 4TB · Desktop
No DE price yet
WDS400T4X0E
WD Black SN7100 · 4TB · Desktop
€580 (€144.96/TB)

Value at a glance

Price / TB
LNM790X004T-RNNNU $176.18
WDS400T4X0E $150.46
Endurance (TBW)
LNM790X004T-RNNNU 3,000 TB
WDS400T4X0E 2,400 TB

Price history

DE · cheapest per day

LNM790X004T-RNNNU €1,403 WDS400T4X0E €580
zoomed · drag to zoom
€1,797 €1,013 €229 Apr 2025 Aug 2025 Nov 2025 Mar 2026 Jul 2026 Nov 2026
LNM790X004T-RNNNU WDS400T4X0E
Capacity 4 TB 4 TB
Form factor M.2 M.2
Interface NVMe NVMe
NAND type TLC TLC
Endurance (TBW) 3,000 TB 2,400 TB
DWPD - -
DRAM cache No No
Power-loss protection No No
Sustained write - -
Cost / TBW $0.235 $0.251
Price / TB $176.18 $150.46
Buy No DE price yet
€580
View at Amazon →

Highlighted cells mark the stronger spec for a NAS build. Failure rates from Backblaze Drive Stats where available; $/TB uses the cheapest live price. Buy links are Amazon affiliate.

LNM790X004T-RNNNU

No Backblaze failure data for this model.

WDS400T4X0E

No Backblaze failure data for this model.