Verdict

These are comparable SSDs. The SKC3000D/4096G 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.

SKC3000D/4096G
Kingston KC3000 · 4TB · Desktop
£629 (£157.22/TB)
WDS400T1X0M
WD Black SN8100 · 4TB · Desktop
£823 (£205.75/TB)

Value at a glance

Price / TB
SKC3000D/4096G $173.97
WDS400T1X0M $175.00
Endurance (TBW)
SKC3000D/4096G 3,200 TB
WDS400T1X0M 2,400 TB

Price history

UK · cheapest per day

SKC3000D/4096G £629 WDS400T1X0M £823
zoomed · drag to zoom
£863 £680 £496 Aug 21 Aug 26 Aug 31 Sep 5 Sep 10 Sep 16
SKC3000D/4096G WDS400T1X0M
Capacity 4 TB 4 TB
Form factor M.2 M.2
Interface NVMe NVMe
NAND type TLC TLC
Endurance (TBW) 3,200 TB 2,400 TB
DWPD - -
DRAM cache Yes Yes
Power-loss protection No No
Sustained write - -
Cost / TBW $0.217 $0.292
Price / TB $173.97 $175.00
Buy
£629
View at Amazon →
£823
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.

SKC3000D/4096G

No Backblaze failure data for this model.

WDS400T1X0M

No Backblaze failure data for this model.