WD Black SN850X 4TB · with heatsink
PCIe 4.0 · 7300/6600 MB/s · 4TB
Samsung 990 EVO Plus 4TB · bare
PCIe 4.0/5.0 · 7250/6300 MB/s · 4TB
Dead heat — it comes down to priorities.
In our weighted Specdex score, WD Black SN850X 4TB · with heatsink lands at 86 and Samsung 990 EVO Plus 4TB · bare at 86. With scores tied, the decision hinges on which sub-scores matter most to you.
Pick WD Black SN850X 4TB · with heatsink if…
- ✓M.2 NVMe
- ✓Competitive per-GB cost
- ✓TBW scales with capacity
Pick Samsung 990 EVO Plus 4TB · bare if…
- ✓M.2 NVMe
- ✓Competitive per-GB cost
- ✓TBW scales with capacity
Winner by scenario
Derived from the sub-score breakdown · not a separate testEndurance & reliability
TieWrite endurance and long-term dependability
Effectively tied — neither pulls a 2-point weighted lead.
Value for money
TieSpecdex score per dollar at MSRP
Effectively tied — similar score-per-dollar at MSRP.
Score breakdown
Specs side-by-side
| Spec | WD Black SN850X 4TB · with heatsink | Samsung 990 EVO Plus 4TB · bare |
|---|---|---|
| Interface | PCIe 4.0 | PCIe 4.0/5.0 |
| Capacity | 4TB | 4TB |
| Read/Write | 7300/6600 MB/s | 7250/6300 MB/s |
WD Black SN850X 4TB · with heatsink
- +M.2 NVMe
- +Competitive per-GB cost
- +TBW scales with capacity
- −Thermals on Gen 5 drives
- −DRAM-less models slower under sustained load
- −Require heatsinks in many systems
Samsung 990 EVO Plus 4TB · bare
- +M.2 NVMe
- +Competitive per-GB cost
- +TBW scales with capacity
- −Thermals on Gen 5 drives
- −DRAM-less models slower under sustained load
- −Require heatsinks in many systems
FAQ: WD Black SN850X 4TB · with heatsink vs Samsung 990 EVO Plus 4TB · bare
Which is better, WD Black SN850X 4TB · with heatsink or Samsung 990 EVO Plus 4TB · bare? +
Both score 86 on our weighted rubric — tied. Your best pick depends on the sub-scores above.
Is WD Black SN850X 4TB · with heatsink worth the price? +
At $380, WD Black SN850X 4TB · with heatsink delivers a Specdex score of 86 — strongest in read.
Is Samsung 990 EVO Plus 4TB · bare worth the price? +
At $360, Samsung 990 EVO Plus 4TB · bare delivers a Specdex score of 86 — strongest in read.
Does WD Black SN850X 4TB · with heatsink or Samsung 990 EVO Plus 4TB · bare 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.