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
C$1,072 (C$267.94/TB)
WDS400T1X0M
WD Black SN8100 · 4TB · Desktop
C$1,057 (C$264.23/TB)

Value at a glance

Price / TB
LNM790X004T-RNNNU $178.05
WDS400T1X0M $192.89
Endurance (TBW)
LNM790X004T-RNNNU 3,000 TB
WDS400T1X0M 2,400 TB

Price history

CA · cheapest per day

LNM790X004T-RNNNU C$1,072 WDS400T1X0M C$1,057
zoomed · drag to zoom
C$1,392 C$1,124 C$857 Aug 22 Aug 31 Sep 10 Sep 19 Sep 29 Oct 9
LNM790X004T-RNNNU WDS400T1X0M
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 $0.237 $0.321
Price / TB $178.05 $192.89
Buy
C$1,072
View at Amazon →
C$1,057
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.

WDS400T1X0M

No Backblaze failure data for this model.