Crucial P1 1TB QLC NVMe SSD Review (2026)
The Crucial P1 1 TB is the capacity where QLC economics start making sense -- 2,000 MB/s reads, 1,700 MB/s writes within the SLC cache, and 200 TBW endurance for a drive that costs less per GB than TLC alternatives.
Controller & Memory
The P1 uses a Silicon Motion SM2263 four-channel NVMe controller with Micron 64-layer 3D QLC NAND and 1 GB DDR3 DRAM. The 1 TB capacity uses 512Gb dies across two NAND packages on a single-sided M.2 2280 PCB. This was the capacity AnandTech reviewed, and it shows the P1 at its best.
QLC NAND stores four bits per cell, making it denser and cheaper than TLC but slower for native writes and less durable. The P1 compensates with a large variable SLC write cache that spans from 12 GB minimum to 100 GB maximum on a fresh 1 TB drive. Within this cache, writes are fast. Once it fills, the drive must fold data into QLC blocks, which is inherently slow.
The 1 TB model posts significantly better specs than the 512 GB: 2,000 MB/s reads (vs 1,900), 1,700 MB/s writes (vs 950), and double the endurance at 200 TBW. Also available in 2 TB (double-sided PCB, 400 TBW). The P1 was one of the first consumer QLC NVMe SSDs alongside the Intel 660p, and both share the same controller and NAND with different firmware and DRAM configurations.
Storage Comparisons:
P1 Performance & Benchmarks
Crucial rates the 1 TB P1 for up to 2,000 MB/s sequential reads and 1,700 MB/s sequential writes over PCIe 3.0 x4, with 170,000 random read IOPS and 240,000 random write IOPS. These numbers are only achievable within the SLC write cache, which can be up to 100 GB on a fresh drive.
Crucial P1 1 TB 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
- Crucial P1 1 TB (this drive): 2,000 MB/s read, 1,750 MB/s write
The P1's variable SLC cache is its defining feature. Unlike most TLC drives, the P1's cache can be very large on a mostly-empty drive. The caching strategy is designed to prevent the QLC write cliff rather than recover from it -- the P1 retains data in SLC for read acceleration and only folds to QLC when necessary. AnandTech found this approach effective for lightweight consumer workloads but inadequate for sustained writes.
When the SLC cache fills, all writes still pass through the SLC layer before being folded into QLC blocks. This means the cache itself acts as a throughput bottleneck during sustained writes, as the drive must simultaneously accept new writes and fold old data. Real-world write performance after cache exhaustion is a fraction of the rated speed.
Crucial P1 vs Competitors
See how the P1 stacks up against other M.2 3.0 x 4 drives in our database:
Compare with rival drives:
Endurance, TBW & Warranty
Crucial rates the 1 TB P1 for 200 TBW of write endurance under a five-year limited warranty, equating to approximately 0.1 drive writes per day. At 10 GB of daily writes, 200 TBW lasts roughly 55 years. The P1 includes partial power loss protection through its write-through SLC caching scheme. The 200 TBW is low for a 1 TB drive -- TLC alternatives like the Samsung 970 EVO Plus offer 600 TBW at the same capacity.
Crucial P1 1 TB Specifications
| Category | Value |
|---|---|
| Capacity [?] | 1 TB |
| Interface [?] | M.2 3.0 x 4 |
| Controller [?] | Silicon Motion SM2263 |
| Memory type [?] | Micron 3D QLC |
| DRAM [?] | DDR3 / DDR4 |
| Read speed (MB/s) [?] | 2000 |
| Write speed (MB/s) [?] | 1750 |
| Read IOPS [?] | 170000 |
| Write IOPS [?] | 240000 |
| Endurance (TBW) [?] | 200 |
| MTBF (million hours) [?] | 1.5 |
| Warranty (years) [?] | 5 |
Verdict: Is the P1 Worth It in 2026?
The Crucial P1 1 TB makes the best case for QLC NVMe: the 1,700 MB/s rated write speed and 200 TBW endurance are adequate for read-heavy consumer use, and the large SLC cache handles occasional write bursts. But the underlying QLC limitations -- slow native writes, low endurance, and a performance cliff when the cache fills -- make it a poor choice for write-heavy or professional workloads. TLC-based alternatives like the Samsung 970 EVO Plus, SK hynix Gold P31, or even the WD Blue SN550 offer better all-around performance and endurance at similar street prices.
+ Pros
- 2,000 MB/s reads, 1,700 MB/s writes within SLC cache
- Large variable SLC cache (up to 100 GB)
- 1 GB DDR3 DRAM for FTL
- Single-sided M.2 2280 at 1 TB
- 200 TBW endurance
- Five-year warranty
- Cons
- QLC NAND with slow native writes
- Sharp performance cliff when SLC cache fills
- Only 200 TBW (0.1 DWPD)
- Superseded by TLC drives at similar prices
- Not suitable for write-heavy workloads
- 170K random read IOPS is low for PCIe 3.0
Buy this or similar SSD Storage:
Video Review
Crucial P1 1TB NVMe m.2 SSD - The best budget NVMe SSD!
