Verdict

For a NAS cache or write-heavy pool, the MZ-V9P4T0 is the safer pick - the MZ-77Q4T0 uses QLC NAND, which wears out faster and slows badly under sustained writes (light, read-mostly use only).

MZ-77Q4T0
Samsung 870 QVO · 4TB · Desktop
$979 ($244.69/TB)
MZ-V9P4T0
Samsung 990 PRO · 4TB · Desktop
$800 ($199.98/TB)

Value at a glance

Price / TB
MZ-77Q4T0 $237.81
MZ-V9P4T0 $192.39
Endurance (TBW)
MZ-77Q4T0 1,440 TB
MZ-V9P4T0 2,400 TB

Price history

US · cheapest per day

MZ-77Q4T0 $979 MZ-V9P4T0 $800
zoomed · drag to zoom
$1,100 $684 $269 Nov 2024 Mar 2025 Aug 2025 Jan 2026 Jun 2026 Nov 2026
MZ-77Q4T0 MZ-V9P4T0
Capacity 4 TB 4 TB
Form factor 2.5 M.2
Interface SATA NVMe
NAND type QLC TLC
Endurance (TBW) 1,440 TB 2,400 TB
DWPD - -
DRAM cache Yes Yes
Power-loss protection No No
Sustained write 160 MB/s -
Cost / TBW $0.661 $0.321
Price / TB $237.81 $192.39
Buy
$979
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$800
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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.

MZ-77Q4T0

No Backblaze failure data for this model.

MZ-V9P4T0

No Backblaze failure data for this model.