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
€1,403 (€350.70/TB)
WDS400T2R0A
WD Red SA500 · 4TB · NAS
€922 (€230.50/TB)

Value at a glance

Price / TB
LNM790X004T-RNNNU $175.00
WDS400T2R0A $232.20
Endurance (TBW)
LNM790X004T-RNNNU 3,000 TB
WDS400T2R0A 2,500 TB

Price history

DE · cheapest per day

LNM790X004T-RNNNU €1,403 WDS400T2R0A €922
zoomed · drag to zoom
€1,727 €1,003 €279 Oct 2024 Mar 2025 Aug 2025 Dec 2025 May 2026 Oct 2026
LNM790X004T-RNNNU WDS400T2R0A
Capacity 4 TB 4 TB
Form factor M.2 2.5
Interface NVMe SATA
NAND type TLC TLC
Endurance (TBW) 3,000 TB 2,500 TB
DWPD - -
DRAM cache No Yes
Power-loss protection No No
Sustained write - -
Cost / TBW $0.233 $0.372
Price / TB $175.00 $232.20
Buy
€1,403
View at Amazon →
€922
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.

WDS400T2R0A

No Backblaze failure data for this model.