WD BLACK SN8100 1TB
1TB · PCIe 5.0 NVMe · 14,900 MB/s read · PassMark #33
WD Black SN850X 2TB · bare
PCIe 4.0 · 7300/6600 MB/s · 2TB
WD Black SN850X 2TB · bare takes it — here’s why.
In our weighted Specdex score, WD BLACK SN8100 1TB lands at 77 and WD Black SN850X 2TB · bare at 86. That puts WD Black SN850X 2TB · bare ahead by 9 points — a decisive margin driven mostly by its strengths in the categories below.
Pick WD BLACK SN8100 1TB if…
- ✓Strong PCIe 5.0 performance at PassMark rank #33
- ✓PCIe 5.0 interface for next-gen platforms (AM5, LGA 1851)
Pick WD Black SN850X 2TB · 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 testValue 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 SN8100 1TB | WD Black SN850X 2TB · bare |
|---|---|---|
| Form factor | M.2 2280 (single-sided) | — |
| Interface | PCIe 5.0 x4 NVMe 2.0 | PCIe 4.0 |
| Sequential read | 14,900 MB/s | — |
| Sequential write | 11,000 MB/s | — |
| Random read | 1,600,000 IOPS | — |
| Random write | 2,400,000 IOPS | — |
| Controller | SanDisk-tuned Silicon Motion SM2508 (6nm, quad Cortex-R8) | — |
| NAND | 218-layer BiCS8 CBA 3D TLC | — |
| DRAM | yes (onboard DRAM) | — |
| Endurance | 600 TBW | — |
| Warranty | 5 years | — |
| PassMark Disk Score | 81,741 | — |
| PassMark rank | #33 of 100 consumer SSDs | — |
| Capacity | — | 2TB |
| Read/Write | — | 7300/6600 MB/s |
WD BLACK SN8100 1TB
- +Strong PCIe 5.0 performance at PassMark rank #33
- +PCIe 5.0 interface for next-gen platforms (AM5, LGA 1851)
- −PCIe 5.0 drives run hot — heatsink or motherboard M.2 cooling recommended
- −Pricing varies — confirm current retail before purchase
WD Black SN850X 2TB · 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 SN8100 1TB vs WD Black SN850X 2TB · bare
Which is better, WD BLACK SN8100 1TB or WD Black SN850X 2TB · bare? +
WD Black SN850X 2TB · bare scores 86 on our weighted rubric — ahead by 9. Your best pick depends on the sub-scores above.
Is WD BLACK SN8100 1TB worth the price? +
At $179, WD BLACK SN8100 1TB delivers a Specdex score of 77 — strongest in passmark_disk.
Is WD Black SN850X 2TB · bare worth the price? +
At $180, WD Black SN850X 2TB · bare delivers a Specdex score of 86 — strongest in read.
Does WD BLACK SN8100 1TB or WD Black SN850X 2TB · 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.