Western Digital
WD Black SN850X 8TB
PCIe 4.0 · 7300/6600 MB/s · 2TB
86
/ 100
From $792
VS
Samsung
Samsung 990 Pro 4TB
PCIe 4.0 · 7450/6900 MB/s · 4TB
86
/ 100
From $360
Specdex verdict
Dead heat — it comes down to priorities.
In our weighted Specdex score, WD Black SN850X 8TB lands at 86 and Samsung 990 Pro 4TB at 86. With scores tied, the decision hinges on which sub-scores matter most to you.
Pick WD Black SN850X 8TB if…
- ✓M.2 NVMe
- ✓Competitive per-GB cost
- ✓TBW scales with capacity
Pick Samsung 990 Pro 4TB if…
- ✓M.2 NVMe
- ✓Competitive per-GB cost
- ✓TBW scales with capacity
WD Black SN850X 8TB 86
vs 86 Samsung 990 Pro 4TB
Score breakdown
WD Black SN850X 8TB
86 read 90
write 88
endurance 88
value 84
Samsung 990 Pro 4TB
86 read 90
write 88
endurance 88
value 84
Specs side-by-side
| Spec | WD Black SN850X 8TB | Samsung 990 Pro 4TB |
|---|---|---|
| Interface | PCIe 4.0 | PCIe 4.0 |
| Capacity | ▲ 8TB | 4TB |
| Read/Write | 7300/6600 MB/s | 7450/6900 MB/s |
WD Black SN850X 8TB
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 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
FAQ: WD Black SN850X 8TB vs Samsung 990 Pro 4TB
Which is better, WD Black SN850X 8TB or Samsung 990 Pro 4TB? +
Both score 86 on our weighted rubric — tied. Your best pick depends on the sub-scores above.
Is WD Black SN850X 8TB worth the price? +
At $792, WD Black SN850X 8TB delivers a Specdex score of 86 — strongest in read.
Is Samsung 990 Pro 4TB worth the price? +
At $360, Samsung 990 Pro 4TB delivers a Specdex score of 86 — strongest in read.
Does WD Black SN850X 8TB or Samsung 990 Pro 4TB 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.