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
$705 ($176.18/TB)
WDS400T4X0E
WD Black SN7100 · 4TB · Desktop
$610 ($152.50/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

US · cheapest per day

LNM790X004T-RNNNU $705 WDS400T4X0E $610
zoomed · drag to zoom
$872 $541 $210 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
$705
View at Amazon →
$610
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.