Left · Samsung
Samsung 990 Pro 4TB
Spec score
Spec score 91
$800
Amazon US, Oct 24
Samsung 990 Pro 4TB against WD Black SN850X 8TB
WD Black SN850X 8TB 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
Samsung 990 Pro 4TB: 91
WD Black SN850X 8TB: 93
2 ptsto the right
Price and value
Worked on typical prices, the figures the comparison is built on.
Value, points per $100
Samsung 990 Pro 4TB: 9.3
WD Black SN850X 8TB: 5.8
60%to the left
Typical price
Samsung 990 Pro 4TB: $980
WD Black SN850X 8TB: $1,600
$620to the left
From the spec sheets
Capacity
Samsung 990 Pro 4TB: 4000 GB
WD Black SN850X 8TB: 8000 GB
100%to the right
Sequential read
Samsung 990 Pro 4TB: 7450 MB/s
WD Black SN850X 8TB: 7300 MB/s
2%to the left
Sequential write
Samsung 990 Pro 4TB: 6900 MB/s
WD Black SN850X 8TB: 6600 MB/s
5%to the left
The verdict
- Samsung 990 Pro 4TB and WD Black SN850X 8TB are level on spec score.
- The Samsung 990 Pro 4TB typically costs $620 less.
- Per dollar, the Samsung 990 Pro 4TB is the better buy: 9.3 points per $100 against 5.8.
Specifications
| Spec | Samsung 990 Pro 4TB | WD Black SN850X 8TB |
|---|---|---|
| Interface | NVMe PCIe 4.0 | NVMe PCIe 4.0 |
| Capacity | 4 TB | 8 TB (better) |
| Sequential read | 7,450 MB/s (better) | 7,300 MB/s |
| Sequential write | 6,900 MB/s (better) | 6,600 MB/s |
| DRAM cache | Yes | Yes |
| Brand | Samsung | Western Digital |
| Released | 2023 | 2025 (better) |
| Typical price | $980 (better) | $1,600 |
The better figure of each pair is in green, with a tick.