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SSD comparison · Updated May 14, 2026

Samsung 990 PRO 4TB vs WD_BLACK SN850X 2TB

Side-by-side: Samsung 990 PRO 4TB ($389) vs WD_BLACK SN850X 2TB ($199). $/TB winner, specs, real-world picks for May 2026.

Samsung 990 PRO 4TB Gen 4

Samsung · Samsung Pascal
$389
$97.25/TB
View on Amazon →

WD_BLACK SN850X 2TB Gen 4

WD · WD G2
$199
$99.50/TB
View on Amazon →
Generation
Gen 4
Gen 4
Price (USD)
$389
$199
Capacity
4 TB
2 TB
$/TB
$97.25
$99.50
Sequential read
7,450 MB/s
7,300 MB/s
Sequential write
6,900 MB/s
6,600 MB/s
Interface
PCIe 4.0 x4
PCIe 4.0 x4
Controller
Samsung Pascal
WD G2
DRAM cache
Yes
Yes
TBW endurance
2,400 TBW
1,200 TBW
Warranty
5 years
5 years
PS5 compatible
Yes
Yes

Verdict: Samsung 990 PRO 4TB vs WD_BLACK SN850X 2TB

Both run on Gen 4 hardware but at different capacities: 4 TB for the Samsung 990 PRO 4TB versus 2 TB for the WD_BLACK SN850X 2TB. Whether the larger drive's $/TB advantage justifies the higher upfront cost depends on how much you actually need.

Hardware-wise, the Samsung 990 PRO 4TB runs on the in-house Samsung Pascal — engineered specifically for the 990 PRO at 8nm. The WD_BLACK SN850X 2TB pairs WD's G2 controller — manufactured by SanDisk and tuned for low-latency gaming workloads.

Samsung 990 PRO 4TB earns higher TBW ratings (2,400 vs 1,200 TBW) — relevant for sustained write workloads, irrelevant for everything else.

Real-world use cases

For PS5 expansion, both are PCIe Gen 4 M.2 2280 drives that meet Sony's minimum spec (7,300 MB/s read). The console can't take advantage of speeds beyond that, so save money by choosing the Samsung 990 PRO 4TB. Note for handheld gamers: M.2 2280 is the desktop/laptop standard. Steam Deck and the ROG Ally line need 2230 drives — neither Samsung 990 PRO 4TB nor WD_BLACK SN850X 2TB fits without modification.

Pick the Samsung 990 PRO 4TB if...

Go with the Samsung 990 PRO 4TB for better $/TB economics ($97.25/TB), and a higher TBW endurance rating (2,400 TBW). Among consumer SSD makers, Samsung's PRO series consistently scores highest on long-term reliability surveys (Backblaze, Puget Systems Q1 2026 data).

Pick the WD_BLACK SN850X 2TB if...

Go with the WD_BLACK SN850X 2TB for the lower retail price ($199 vs $389). Among Gen 4 flagships, the SN850X strikes a sweet spot — premium silicon at sub-Samsung pricing, with WD's established RMA process to back it up.

Best value for money

Samsung 990 PRO 4TB
$97.25/TB beats the alternative by 2%

Best for gaming

Samsung 990 PRO 4TB
Strong $/MB-s ratio for game loads, and fits the PS5 expansion slot

Best for content creators

Samsung 990 PRO 4TB
Best write-heavy profile here: 6,900 MB/s sustained, 2,400 TBW

Best for PS5

Samsung 990 PRO 4TB
PS5-compatible Gen 4 at $97.25/TB
FAQ

Samsung 990 PRO 4TB vs WD_BLACK SN850X 2TB — common questions

What's the price difference between Samsung 990 PRO 4TB and WD_BLACK SN850X 2TB?

The Samsung 990 PRO 4TB costs $389 (97.25 per TB), while the WD_BLACK SN850X 2TB runs $199 (99.50 per TB). The gap is $190, equivalent to about 2% per TB. Prices change weekly; check current Amazon listings before deciding.

Does the Samsung 990 PRO 4TB's read advantage matter in practice?

Specs say yes (7,450 MB/s versus 7,300 MB/s). Real-world testing says rarely. Game load times and OS boots saturate well below either drive's peak read speed. The advantage shows up in sustained sequential reads — large file copies, raw video reads, dataset loads.

Will the Samsung 990 PRO 4TB or WD_BLACK SN850X 2TB work in my PlayStation 5?

Yes to both — both meet Sony's expansion specs (PCIe Gen 4 NVMe, M.2 2280, with a heatsink). The PS5 won't differentiate between them in benchmarks because its internal storage controller throttles to PCIe Gen 4 speeds. Samsung 990 PRO 4TB wins this matchup if price is your tiebreaker.

How much does the 1,200 TBW endurance gap actually matter?

For most buyers, it doesn't. The Samsung 990 PRO 4TB's 2,400 TBW versus the WD_BLACK SN850X 2TB's 1,200 TBW translates to years of additional theoretical lifetime, but consumer drives almost always die from controller failure or firmware issues long before reaching TBW limits.

Bottom line: Samsung 990 PRO 4TB or WD_BLACK SN850X 2TB?

Default recommendation: Samsung 990 PRO 4TB. It hits the right balance of price ($97.25/TB), Gen 4 performance, and brand support for the average buyer. The WD_BLACK SN850X 2TB has its place if you need specific brand preference, but that's a narrower use case.

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