New
Samsung PM991 512GB PCIe 4.0 x4 NVMe M.2 2242
Capacity 512GB
Form Factor M.2 2242
Interface PCIe 4.0 x4
NAND TLC
49 Overall Score
No current retailer price
Snapshot
Pros & Cons
Pros
- Strong speed (68th percentile) 68th
Cons
- Below average endurance (15th percentile)
- Below average capacity (35th percentile)
The proof
Performance
Specifications
Full Specifications
Drive
| Capacity | 512 |
| Form Factor | M.2 2242 |
| Interface | PCIe 4.0 x4 |
| Protocol | NVMe |
| PCIe Generation | 4 |
| External | No |
Hardware
| NAND | TLC |
vs Competition
| Spec | Samsung PM991 | Western Digital WD_BLACK SN850X | Kingston FURY Renegade G5 SFYR2S/4T0 | SanDisk WD_BLACK SN8100 | Crucial T705 | Lexar NM1090 PRO |
|---|---|---|---|---|---|---|
| Capacity | 512GB | 8TB | 4TB | 8TB | 4TB | 4TB |
| Form Factor | M.2 2242 | M.2 2280 | M.2 2280 | M.2 2280 | M.2 2280 | M.2 2280 |
| Interface | PCIe 4.0 x4 | PCIe 4.0 x4 | PCIe 5.0 x4 | PCIe 5.0 x4 | PCIe 5.0 x4 | PCIe 5.0 x4 |
| Seq Read | - | 7,200 MB/s | 14,800 MB/s | 14,900 MB/s | 14,100 MB/s | 14,000 MB/s |
| Nand Type | TLC | TLC | TLC | TLC | TLC | SLC |
| Dram Cache | - | true | true | true | true | true |
| Endurance | - | 4800 TBW | 4000 TBW | 4800 TBW | - | 2800 TBW |
| Compare | Compare | Compare | Compare | Compare |
| Product | Speed | Random | Feature | Capacity | Endurance | Affordability |
|---|---|---|---|---|---|---|
| Samsung PM991 | 67.8 | 61.7 | 53.8 | 34.6 | 14.7 | 63.1 |
| Western Digital WD_BLACK SN850X Compare | 87.5 | 96.4 | 93.9 | 98.2 | 88.2 | 3.8 |
| Kingston FURY Renegade G5 SFYR2S/4T0 Compare | 99.4 | 98.9 | 90.8 | 92.6 | 93.5 | 6.3 |
| SanDisk WD_BLACK SN8100 Compare | 99 | 99.3 | 97.6 | 98.2 | 80.9 | 3.2 |
| Crucial T705 Compare | 97.9 | 98 | 97.6 | 92.6 | 57.3 | 8.7 |
| Lexar NM1090 PRO Compare | 98.1 | 98.4 | 97.6 | 92.6 | 75 | 9.6 |
Price
Value & Pricing
We started tracking prices for this product on Nov 9, 2026. The chart appears once we have more data.
Usage Scores
A full written review is coming soon. The specs, scores, prices and charts above are always up to date.
