Left · Western Digital
WD Black SN8100 4TB
Spec score
Spec score 99
$860
Amazon US, Oct 24
WD Black SN8100 4TB against WD Black SN850X 8TB
WD Black SN8100 4TB leads on the overall index. The price beside each button is the Amazon US reading where ScoutPrices has one; the comparison below is worked on typical prices.
Right · Western Digital
WD Black SN850X 8TB
Spec score
Spec score 93
$1,600
typical price
Head to head
Scores
Indices out of 100 on ScoutSpecs' own scale, one per kind of work. They are not frames per second and not a measurement of any one sample.
Spec score
WD Black SN8100 4TB: 99
WD Black SN850X 8TB: 93
6 ptsto the left
Price and value
Worked on typical prices, the figures the comparison is built on.
Value, points per $100
WD Black SN8100 4TB: 15
WD Black SN850X 8TB: 5.8
159%to the left
Typical price
WD Black SN8100 4TB: $660
WD Black SN850X 8TB: $1,600
$940to the left
From the spec sheets
Capacity
WD Black SN8100 4TB: 4000 GB
WD Black SN850X 8TB: 8000 GB
100%to the right
Sequential read
WD Black SN8100 4TB: 14900 MB/s
WD Black SN850X 8TB: 7300 MB/s
104%to the left
Sequential write
WD Black SN8100 4TB: 14000 MB/s
WD Black SN850X 8TB: 6600 MB/s
112%to the left
The verdict
- The WD Black SN8100 4TB scores 6% higher on the ScoutSpecs index.
- The WD Black SN8100 4TB typically costs $940 less.
- Per dollar, the WD Black SN8100 4TB is the better buy: 15 points per $100 against 5.8.
Specifications
| Spec | WD Black SN8100 4TB | WD Black SN850X 8TB |
|---|---|---|
| Interface | NVMe PCIe 5.0 | NVMe PCIe 4.0 |
| Capacity | 4 TB | 8 TB (better) |
| Sequential read | 14,900 MB/s (better) | 7,300 MB/s |
| Sequential write | 14,000 MB/s (better) | 6,600 MB/s |
| DRAM cache | Yes | Yes |
| Brand | Western Digital | Western Digital |
| Released | 2025 | 2025 |
| Typical price | $660 (better) | $1,600 |
The better figure of each pair is in green, with a tick.