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
€543 (€135.73/TB)
WDS400T2X0E
WD Black SN850X · 4TB · Desktop
€842 (€210.50/TB)

Value at a glance

Price / TB
LNM790X004T-RNNNU $125.00
WDS400T2X0E $169.75
Endurance (TBW)
LNM790X004T-RNNNU 3,000 TB
WDS400T2X0E 2,400 TB

Price history

IT · cheapest per day

LNM790X004T-RNNNU €543 WDS400T2X0E €842
zoomed · drag to zoom
€842 €692 €543 Aug 21 Aug 24 Aug 27 Aug 30 Sep 2 Sep 6
LNM790X004T-RNNNU WDS400T2X0E
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 Yes
Power-loss protection No No
Sustained write - -
Cost / TBW $0.167 $0.283
Price / TB $125.00 $169.75
Buy
€543
View at Amazon →
€842
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.

WDS400T2X0E

No Backblaze failure data for this model.