Western Digital
WD Black SN850X 4TB
PCIe 4.0 · 7300/6600 MB/s · 4TB
86
/ 100
From $360
VS
Samsung 990 Pro 2TB wins by 6
Samsung
Samsung 990 Pro 2TB
PCIe 4.0 · 7,450/6,900 MB/s
92
/ 100
From $199
Specdex verdict
Samsung 990 Pro 2TB takes it — here’s why.
In our weighted Specdex score, WD Black SN850X 4TB lands at 86 and Samsung 990 Pro 2TB at 92. That puts Samsung 990 Pro 2TB ahead by 6 points — a decisive margin driven mostly by its strengths in the categories below.
Pick WD Black SN850X 4TB if…
- ✓M.2 NVMe
- ✓Competitive per-GB cost
- ✓TBW scales with capacity
Pick Samsung 990 Pro 2TB if…
- ✓Best-in-class sustained speeds
- ✓1200 TBW endurance
- ✓Magician toolkit
WD Black SN850X 4TB 86
vs 92 Samsung 990 Pro 2TB
Score breakdown
WD Black SN850X 4TB
86 read 90
write 88
endurance 88
value 84
Samsung 990 Pro 2TB
92 read 96
write 94
endurance 92
value 86
Specs side-by-side
| Spec | WD Black SN850X 4TB | Samsung 990 Pro 2TB |
|---|---|---|
| Interface | PCIe 4.0 | PCIe 4.0 x4 NVMe |
| Capacity | 4TB | — |
| Read/Write | 7300/6600 MB/s | — |
| Read speed | — | 7,450 MB/s |
| Write speed | — | 6,900 MB/s |
| TBW | — | 1200 |
| Form | — | M.2 2280 |
WD Black SN850X 4TB
Pros
- +M.2 NVMe
- +Competitive per-GB cost
- +TBW scales with capacity
Cons
- −Thermals on Gen 5 drives
- −DRAM-less models slower under sustained load
- −Require heatsinks in many systems
Samsung 990 Pro 2TB
Pros
- +Best-in-class sustained speeds
- +1200 TBW endurance
- +Magician toolkit
Cons
- −Only PCIe 4.0
- −No included heatsink
- −Premium price
FAQ: WD Black SN850X 4TB vs Samsung 990 Pro 2TB
Which is better, WD Black SN850X 4TB or Samsung 990 Pro 2TB? +
Samsung 990 Pro 2TB scores 92 on our weighted rubric — ahead by 6. Your best pick depends on the sub-scores above.
Is WD Black SN850X 4TB worth the price? +
At $360, WD Black SN850X 4TB delivers a Specdex score of 86 — strongest in read.
Is Samsung 990 Pro 2TB worth the price? +
At $199, Samsung 990 Pro 2TB delivers a Specdex score of 92 — strongest in read.
Does WD Black SN850X 4TB or Samsung 990 Pro 2TB last longer? +
Based on our long-term update and support ratings, both ship with multi-year support. Battery and reliability scores are visible in the breakdown above.