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
$580 ($145.00/TB)
MZ-V9P4T0
Samsung 990 PRO · 4TB · Desktop
$992 ($248.05/TB)

Value at a glance

Price / TB
LNM790X004T-RNNNU $145.00
MZ-V9P4T0 $164.78
Endurance (TBW)
LNM790X004T-RNNNU 3,000 TB
MZ-V9P4T0 2,400 TB

Price history

US · cheapest per day

LNM790X004T-RNNNU $580 MZ-V9P4T0 $992
zoomed · drag to zoom
$1,100 $684 $269 Sep 2024 Feb 2025 Jul 2025 Nov 2025 Apr 2026 Sep 2026
LNM790X004T-RNNNU MZ-V9P4T0
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 $0.193 $0.275
Price / TB $145.00 $164.78
Buy
$580
View at Amazon →
$992
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.

MZ-V9P4T0

No Backblaze failure data for this model.