Samsung 990 Pro NVMe SSD vs WD Black SN850X NVMe SSD
Verdict: Samsung 990 Pro wins on raw speed with 7450/6900 MB/s versus 7300/6600 MB/s on the WD Black SN850X per manufacturer data and Tom's Hardware benchmarks. The WD model provides stronger value in sustained workloads and often includes a heatsink option at similar pricing. Both deliver excellent real-world gaming and productivity performance according to AnandTech reviews.
Winner: Samsung 990 Pro NVMe SSD
Samsung 990 Pro NVMe SSD: 8.5/10
WD Black SN850X NVMe SSD: 8/10
Spec-by-spec comparison
| Samsung 990 Pro NVMe SSD | WD Black SN850X NVMe SSD | |
|---|---|---|
| Interface | PCIe 4.0 x4 | PCIe 4.0 x4 |
| Sequential Read | 7450 MB/s | 7300 MB/s |
| Sequential Write | 6900 MB/s | 6600 MB/s |
| DRAM Cache | Yes | Yes |
Samsung 990 Pro NVMe SSD
What works
- 7450 MB/s read and 6900 MB/s write speeds (per Samsung specs)
- 1.5M IOPS for random performance
- 5-year warranty with 1200 TBW rating
What doesn't
- Runs hotter without heatsink
- Higher price per TB than some competitors
WD Black SN850X NVMe SSD
What works
- 7300 MB/s read and 6600 MB/s write speeds (per WD specs)
- Strong sustained performance with heatsink
- 5-year warranty with up to 2400 TBW on 4TB model
What doesn't
- Slightly lower peak speeds than Samsung 990 Pro
- No DRAM on some lower-capacity variants
Bottom line
Our pick: Samsung 990 Pro NVMe SSD. It edges out the alternative on 7450 mb/s read and 6900 mb/s write speeds (per samsung specs). That said, WD Black SN850X NVMe SSD still wins on 7300 mb/s read and 6600 mb/s write speeds (per wd specs) — consider it if that single trade matters most for your use.
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