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$1,167 (C$291.73/TB)
WDS400T4X0E
WD Black SN7100 · 4TB · Desktop
C$824 (C$206.11/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

CA · cheapest per day

LNM790X004T-RNNNU C$1,167 WDS400T4X0E C$840
zoomed · drag to zoom
C$1,454 C$887 C$319 Nov 2024 Mar 2025 Aug 2025 Jan 2026 Jun 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
C$1,167
View at Amazon →
C$824
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.