Intel 660P 512GB — First-Gen Consumer QLC NVMe SSD
The Intel 660P 512GB was one of the first consumer QLC NVMe SSDs, bringing quad-level cell NAND to the mainstream — but the trade-offs in endurance and sustained write performance are significant.
The Intel 660P 512GB uses the Silicon Motion SM2263 controller with Intel 64-layer 3D QLC NAND and 256MB of Nanya DDR3 DRAM. It is a PCIe 3.0 x4 NVMe 1.3 drive in the M.2 2280 form factor. Launched in 2018, the 660P was Intel's first consumer QLC SSD and one of the first QLC NVMe drives available to mainstream buyers.
Sequential performance is rated at up to 1,800 MB/s reads and 1,800 MB/s writes, with 220K IOPS for both reads and writes. These numbers are modest compared to TLC Gen3 drives, but the 660P was positioned as a budget NVMe option — at launch, it undercut TLC competitors by a significant margin.
The 660P line is available in 512GB, 1TB, and 2TB capacities. The 512GB model has the lowest endurance at 100 TBW — among the lowest for any 512GB NVMe drive. The 1TB model is rated at 200 TBW and the 2TB at 400 TBW. Intel backs the 660P with a 5-year warranty and rates it at 1.6 million hours MTBF.
QLC NAND stores 4 bits per cell, which increases density and reduces cost but comes with lower endurance and slower sustained write speeds. The 660P's SLC cache handles burst writes well, but once it exhausts, direct-to-QLC write speed drops to approximately 100-150 MB/s — slower than a mechanical hard drive.
Key rivals include the Intel 665P (newer, faster, higher endurance), the Intel 670P (much faster, higher endurance), the Crucial P1 500GB (similar QLC tier), and the WD Blue SN570 500GB (TLC, much faster). The 660P has been superseded by two generations of Intel QLC drives.
✅ Storage Comparisons:
🚀 Performance and benchmarks
The Intel 660P 512GB is rated at up to 1,800 MB/s sequential reads and 1,800 MB/s sequential writes, with random performance up to 220K IOPS for both reads and writes. These numbers were competitive for a budget NVMe drive at launch but have been surpassed by subsequent QLC and TLC generations.
Intel 660P 512 GB vs M.2 3.0 x 4 peers
Switch between sequential throughput and random IOPS to see how this drive stacks up against other M.2 3.0 x 4 SSDs in our database. The highlighted bar is the drive on this page — click any other bar to open that drive.
- ADATA SX 8800 Pro 512 GB: 3,500 MB/s read, 2,700 MB/s write
- ADATA SX 8800 Pro 1 TB: 3,500 MB/s read, 2,700 MB/s write
- ADATA XPG Spectrix S40G RGB 256 GB: 3,500 MB/s read, 3,000 MB/s write
- ADATA XPG Spectrix S40G RGB 512 GB: 3,500 MB/s read, 3,000 MB/s write
- Intel 660P 512 GB (this drive): 1,800 MB/s read, 1,800 MB/s write
The SLC cache absorbs burst writes effectively for small file transfers. However, QLC NAND's direct write speed is significantly lower than TLC. During sustained writes that exceed the cache — roughly 12-40 GB depending on free space — throughput drops to approximately 100-150 MB/s. This is noticeably slower than even a SATA SSD and dramatically slower than TLC NVMe drives.
Independent reviews at AnandTech, HotHardware, and StorageReview confirmed the 660P's modest performance and highlighted the QLC trade-offs. The drive is faster than SATA for sequential reads and light workloads, but the sustained write limitation is a genuine bottleneck for any workload involving large file transfers.
For typical consumer workloads that are primarily read-bound — OS boot, web browsing, light productivity — the 660P is adequate. The limitation shows up during large file transfers, game installations, and any sustained write workload.
🖥️ Endurance and warranty
Intel backs the 660P 512GB with a 5-year limited warranty and a 100 TBW endurance rating. At 30 GB of writes per day, that is roughly 9 years of theoretical endurance. The drive is rated for 1.6 million hours MTBF. The 100 TBW is among the lowest for a 512GB NVMe drive — the Crucial P5 500GB, for example, is rated at 300 TBW. For write-heavy workloads, a TLC drive is a better choice.
📊 Specs
| Category | Value |
|---|---|
| Capacity [?] | 512 GB |
| Interface [?] | M.2 3.0 x 4 |
| Controller [?] | Silicon Motion 2263 |
| Memory type [?] | Intel QLC |
| DRAM [?] | Nanya 256MB DDR3 |
| Read speed (MB/s) [?] | 1800 |
| Write speed (MB/s) [?] | 1800 |
| Read IOPS [?] | 220000 |
| Write IOPS [?] | 220000 |
| Endurance (TBW) [?] | 100 |
| MTBF (million hours) [?] | 1.6 |
| Warranty (years) [?] | 5 |
Conclusion
The Intel 660P 512GB is a first-generation QLC NVMe drive that makes sense only at a deep discount on the used market. The 100 TBW endurance is the main concern — it is 3x lower than the Crucial P5 500GB. For a similar price, the WD Blue SN570 500GB offers dramatically better performance and endurance. The 660P is only worth considering if you find it significantly cheaper than TLC alternatives and your workload is primarily read-bound.
+ Pros
- 5-year warranty
- Intel 64-layer QLC NAND with DRAM cache
- Budget-friendly NVMe option
- 1,800/1,800 MB/s sequential speeds
- Cons
- 100 TBW endurance — among lowest for 512GB NVMe
- Sustained write speed drops to 100-150 MB/s
- Outclassed by WD Blue SN570 at similar price
- Superseded by 665P and 670P
- QLC NAND limits write-heavy workloads
🛒 Buy this or similar SSD Storage:
✨ Video Review
Intel 660p NVMe SSD — Should You Buy One? — Review
