Western Digital WD_Black SN850X 4TB
The current Western Digital WD_Black SN850X 4TB price from retailers, its key specifications, and how it performs for each job.
Western Digital · SSD · PCIe 4.0
Retailer photo of Western Digital WD_Black SN850X 4TB. View this offer in Where to buy
Works well for: System Drive, Game & File Storage, Heavy Creative Work
Trade-offs: Current price sits CAD 41 above the strong-value threshold (~CAD 859)
- Capacity
- 4 TB
- Interface
- M.2 PCIe 4.0 x4
- Sequential read
- 7300 MB/s
- Sequential write
- 6600 MB/s
- Endurance
- 2400 TBW
- Form factor
- M.2-2280
Move a slider and the page re-scores this product against the same market frame.
What does it cost today, and is that a good price?
Market confidence: MediumAt CAD 900 the Western Digital WD_Black SN850X 4TB is priced 4% below its CAD 940 representative market level. Only 2 verified new offers stand behind it, so the level can move quickly.
Consider: TeamGroup MP44Q 4TB offers stronger value around CAD 640.Compare
Prices & availability
Western Digital WD_Black SN850X 4TB: current price and offers
Compare the offers we track for this model, across variants and retailers.
3 tracked offers · 2 retailers
| Variant | Store | Condition | Price (snapshot) | Value · Balanced | Checked | Offer link |
|---|---|---|---|---|---|---|
| Western Digital WD_Black SN850X 4TB | Newegg | New | CAD 900 | 77 | 2026-10-29 | View offer → |
| Western Digital WD_Black SN850X 4TB | Amazon | New | Check on Amazon | 74 | 2026-10-29 | View offer → |
| Western Digital WD_Black SN850X 4TB (Heatsink) | Newegg | New | CAD 980 | 73 | 2026-10-29 | View offer → |
| Western Digital WD_Black SN850X 4TBMultiple variants available | Amazon Affiliate | Varies | Find on Amazon | Not tracked | No price snapshot | Find on Amazon → |
Prices are dated snapshots, not live quotes — confirm the final price at the store. New, refurbished and used offers are listed separately; used offers carry warranty and seller risk.
Performance and where it ranks
Two different questions, side by side. Performance compares what the hardware can do; Value compares what that capability costs at today’s price. A product can rank high on one and low on the other — that gap is the point.
Performance Balanced
How much it can do. Price plays no part in this ranking.
#26 of 182 graded solid state drives
- #23 PatriotPatriot Viper VP4300 Lite 1TB 50
- #24 LexarLexar NM790 1TB 50
- #25 Western DigitalWestern Digital Black SN850X 8TB 49
- #26 Western DigitalWestern Digital WD_Black SN850X 4TB 49
- #27 KingstonKingston KC3000 4TB 49
- #28 KingstonKingston Fury Renegade Heat Sink 4TB 49
- #29 Western DigitalWestern Digital SN850P 2TB 49
Value Balanced
How much of that you get for today’s price.
#18 of 182 currently priced solid state drives
- #15 Western DigitalWestern Digital SN7100 2TB 81
- #16 KingstonKingston NV3 2TB 79
- #17 CorsairCorsair MP700 PRO 2TB 78
- #18 Western DigitalWestern Digital WD_Black SN850X 4TB 77
- #19 TeamGroupTeamGroup FORCE G70 PRO Aluminum 2TB 76
- #20 TeamGroupTeamGroup MP44 1TB 76
- #21 KingstonKingston KC3000 4TB 76
Performance System Drive
How much it can do. Price plays no part in this ranking.
#26 of 182 graded solid state drives
- #23 PatriotPatriot Viper VP4300 Lite 1TB 50
- #24 LexarLexar NM790 1TB 50
- #25 Western DigitalWestern Digital Black SN850X 8TB 49
- #26 Western DigitalWestern Digital WD_Black SN850X 4TB 49
- #27 KingstonKingston KC3000 4TB 49
- #28 KingstonKingston Fury Renegade Heat Sink 4TB 49
- #29 Western DigitalWestern Digital SN850P 2TB 49
Value System Drive
How much of that you get for today’s price.
#36 of 182 currently priced solid state drives
- #33 SamsungSamsung 990 EVO Plus 2TB 34
- #34 Western DigitalWestern Digital Black SN850X 2TB 34
- #35 SamsungSamsung 990 EVO Plus 1TB 34
- #36 Western DigitalWestern Digital WD_Black SN850X 4TB 33
- #37 CorsairCorsair MP600 PRO XT 2TB 32
- #38 SamsungSamsung 990 Pro 1TB 32
- #39 CrucialCrucial P310 1TB 31
Performance Game
How much it can do. Price plays no part in this ranking.
#9 of 182 graded solid state drives
- #6 SamsungSamsung 990 Pro 4TB 50
- #7 TeamGroupTeamGroup MP44Q 4TB 50
- #8 TeamGroupTeamGroup MP44 4TB 50
- #9 Western DigitalWestern Digital WD_Black SN850X 4TB 50
- #10 KingstonKingston KC3000 4TB 50
- #11 KingstonKingston Fury Renegade Heat Sink 4TB 50
- #12 SamsungSamsung 990 EVO Plus 4TB 50
Value Game
How much of that you get for today’s price.
#9 of 182 currently priced solid state drives
- #6 TeamGroupTeamGroup Force Vulcan 4TB 83
- #7 TeamGroupTeamGroup QX 4TB 82
- #8 KingstonKingston NV3 4TB 81
- #9 Western DigitalWestern Digital WD_Black SN850X 4TB 80
- #10 Western DigitalWestern Digital SN8100 4TB 77
- #11 SamsungSamsung 9100 PRO 4TB 76
- #12 KingstonKingston KC3000 4TB 76
Performance Heavy Creative Work
How much it can do. Price plays no part in this ranking.
#29 of 182 graded solid state drives
- #26 TeamGroupTeamGroup FORCE G70 PRO Graphene 2TB 50
- #27 CorsairCorsair MP600 PRO XT 2TB 50
- #28 Western DigitalWestern Digital Black SN850X 8TB 48
- #29 Western DigitalWestern Digital WD_Black SN850X 4TB 48
- #30 Western DigitalWestern Digital SN850P 2TB 48
- #31 Western DigitalWestern Digital Black SN850X 2TB 48
- #32 Western DigitalWestern Digital Black SN850X 1TB 48
Value Heavy Creative Work
How much of that you get for today’s price.
#16 of 182 currently priced solid state drives
- #13 KingstonKingston KC3000 4TB 35
- #14 CrucialCrucial P510 2TB 31
- #15 TeamGroupTeamGroup MP44 2TB 31
- #16 Western DigitalWestern Digital WD_Black SN850X 4TB 30
- #17 TeamGroupTeamGroup MP44Q 2TB 30
- #18 Western DigitalWestern Digital SN7100 2TB 29
- #19 TeamGroupTeamGroup FORCE G70 PRO Aluminum 2TB 28
These ladders follow the preset scenario shown above. Your own weights re-score this product, not the whole field.
What it is good for
| Scenario | this productCapability grade · Value at current price | Higher capability | Higher Value with current priorities |
|---|---|---|---|
| Balanced (all-round)Weighted all-round view | GradeNo grade Value77 | Higher capability Samsung 9100 PRO 2TB 86 +101% capability · -17% price | Higher Value with current priorities TeamGroup MP44Q 4TB 98 +1% capability |
| System DriveScenario capability | GradeS Value33 | Higher capability Samsung 9100 PRO 2TB S 92 +101% capability · -17% price | Higher Value with current priorities Crucial T710 2TB S 100 +99% capability · -30% price |
| Game & File StorageScenario capability | GradeS Value80 | — | Higher Value with current priorities TeamGroup MP44Q 4TB S 100 +0% capability |
| Heavy Creative WorkScenario capability | GradeS Value30 | Higher capability Higher capability · Higher Value with current priorities Crucial T710 2TB S 81 +108% capability · -30% price | |
Balanced has no letter: it is a weighting preset, not a capability rubric. A grade answers “how well does this handle that job?” — price is never part of it. Relative Value puts the current market price back in.
Compare these grades with the full tier list
Browse shortlists for different uses
Trade-offs
Works well if
- System Drive is your main prioritygraded S for System Drive on the same rubric as the tier list
- Strong-value threshold: ~CAD 859CAD 859 is where Relative Value reaches 80 with Balanced priorities, in the 2026-10-27–2026-10-29 offer frame
Consider other options if
- Current price sits CAD 41 above the strong-value threshold (~CAD 859)cheapest tracked CAD 900 against a CAD 859 calculated threshold with Balanced priorities
- Value for money matters more to you than this exact modelTeamGroup MP44Q 4TB holds Relative Value 98 against its 77 with Balanced priorities. Check on Amazon.
Works well if
- System Drive is your main prioritygraded S for System Drive on the same rubric as the tier list
Consider other options if
- You want strong value for System Drive specificallycompeting products deliver so much more for System Drive per dollar that no price this model realistically trades at reaches the strong-value mark for this job
- Value for money matters more to you than this exact modelCrucial T710 2TB holds Relative Value 100 against its 33 for System Drive, at CAD 630
- You are buying for System Drive and want no asterisksthe rubric caps this grade: read speed taken from another capacity of the same drive family — not measured for this exact model
Works well if
- Game is your main prioritygraded S for Game on the same rubric as the tier list
- Today's price already clears the strong-value markcheapest tracked CAD 900 against a CAD 901 threshold for Game
Consider other options if
- Value for money matters more to you than this exact modelTeamGroup MP44Q 4TB holds Relative Value 100 against its 80 for Game. Check on Amazon.
Works well if
- Heavy Creative Work is your main prioritygraded S for Heavy Creative Work on the same rubric as the tier list
Consider other options if
- You want strong value for Heavy Creative Work specificallycompeting products deliver so much more for Heavy Creative Work per dollar that no price this model realistically trades at reaches the strong-value mark for this job
- Value for money matters more to you than this exact modelCrucial T710 2TB holds Relative Value 81 against its 30 for Heavy Creative Work, at CAD 630
- You are buying for Heavy Creative Work and want no asterisksthe rubric caps this grade: write speed inferred, not measured for this exact model
Every line states the fact it was derived from, for the scenario selected above. Thresholds are calculated points on our value curve — information about where the maths turns, not instructions about what to pay.
Similar options to the Western Digital WD_Black SN850X 4TB
Chosen for Balanced
Chosen for System Drive
Chosen for Game
Chosen for Heavy Creative Work
Alternatives stay near this product’s price range. Step-up options may exceed the standard budget envelope when the capability gain is meaningful.
More head-to-head comparisons in this category
Upgrade planner
Judge the change in the active scenario, then make the cash gap explicit.
Using page scenarioWhat are you upgrading from? These are the axes we compare on, and where this product stands in the current market.
Capability differences are expressed as tiers and index points, not as benchmark percentages we did not measure.
Specifications and compatibility
What this product is, and what to check before it goes into your build.
Performance
- Sequential read
- 7300 MB/s
- Sequential write
- 6600 MB/s
- Random read
- 0 IOPS
- Random write
- 0 IOPS
- Controller
- WD Proprietary
Media
- Capacity
- 4 TB
- NAND type
- SanDisk 112-layer TLC
- DRAM cache
- 4GB DDR4
Power / Interface
- Interface
- M.2 PCIe 4.0 x4
- Form factor
- M.2-2280
Physical / Outputs
- Heatsink included
- No
Show all specifications
Endurance & warranty
- Endurance
- 2400 TBW
- Warranty
- 5 years
- Manufacturer part number
- WDS400T2X0E
Hover any value to see where it came from: a manufacturer specification, or a figure The Comparator calculated.
Sources: Comparator offer frame 2026-10-27–2026-10-29
What to check in your build
M.2-2280
The slot must take M.2-2280
M.2 PCIe 4.0 x4
PCIe 4.0 M.2 slot for full speed
PCIe 4.0 — runs in older slots at their speed
Fits under an M.2 shroud
Bare drive — it fits under a motherboard M.2 shroud
Meets the PS5 expansion requirements
M.2 2280 NVMe, PCIe 4.0, 7300 MB/s read — meets Sony's published requirements; a heatsink is required
Found an error? Report this specification Email the field, corrected value and an optional source.
Compatibility guidance is practical help, not a score. Missing data is shown as unknown, never invented.
Summary
Western Digital WD_Black SN850X 4TB offers a balanced view across an all-round mix of priorities. It ranks #26 by capability in the current modelled field. Its clearest measured strength is drive capability 7300. TeamGroup MP44Q 4TB currently clears the same practical bar with stronger Relative Value.
Western Digital WD_Black SN850X 4TB offers S-grade capability for System Drive. It ranks #26 by capability in the current modelled field. Its clearest measured strength is drive capability 7300. TeamGroup MP44Q 4TB currently clears the same practical bar with stronger Relative Value.
Western Digital WD_Black SN850X 4TB offers S-grade capability for Game. It ranks #9 by capability in the current modelled field. Its clearest measured strength is drive capability 7300. TeamGroup MP44Q 4TB currently clears the same practical bar with stronger Relative Value.
Western Digital WD_Black SN850X 4TB offers S-grade capability for Heavy Creative Work. It ranks #29 by capability in the current modelled field. Its clearest measured strength is drive capability 7300. TeamGroup MP44Q 4TB currently clears the same practical bar with stronger Relative Value.
FAQ
Why does Relative Value change when I choose another scenario?
Each scenario changes the weights applied to capability, price and the other published factors. The hardware facts stay fixed, but the value question changes, so its score and rank can change too.
Why can Amazon appear without a tracked price?
Amazon listing snapshots can participate in Value while fresh. We show Check on Amazon instead of its price; confirm the current price and availability at the store. When no current listing snapshot exists, Amazon is a search link only.
Useful links & sources
offer frame 2026-10-27–2026-10-29 · formula ssd-value-v1.5 · facts facts-2026-10-29 · Relative Value is an estimate from our current dataset, the selected weights and dated market prices — not an official product rating and not a price forecast. Target prices are calculation thresholds, not predictions. Methodology We are not a shop. Affiliate links may earn us a commission; they never change the calculations or the ranking.