Klevv C950 1TB PCIe 5.0 NVMe SSD Review (2026)
The Klevv C950 1TB is Klevv's entry into PCIe 5.0 territory, pairing a Phison E26 controller with hand-selected TLC NAND to reach 13,000 MB/s sequential reads under an integrated heatsink.
Controller & Memory
Klevv's C950 line is the brand's PCIe 5.0 flagship, sold under the GENUINE G560 name in some regions and built around the Phison PS5026-E26 eight-channel controller that defines the Gen5 mainstream. The 1TB variant is the smallest of three capacities (also available in 2TB and 4TB), and as is typical for an E26 drive at this size, the rated sequential read of 13,000 MB/s is a touch below the 14,000 MB/s claimed for the larger SKUs, while sequential write lands at 9,500 MB/s. Those numbers still roughly double what a top PCIe 4.0 drive can deliver.
Inside the 1TB model you get strictly-selected 3D TLC NAND running at 2,400 MT/s with a DRAM cache buffer that Phison's platform uses to map the flash and accelerate sustained workloads. Klevv ships the drive with a pre-installed duotone aluminum heatsink and a stabilizing protective base, so it is not the bare-M.2 pick for a slim laptop slot, but it is ideal for a desktop board with a chipset heatsink mount. The bundled design keeps thermals in check, which matters because Gen5 drives throttle hard without active cooling. Microsoft DirectStorage and AES 256-bit hardware encryption are both supported.
The audience for the 1TB C950 is the early-adopter PC builder who wants a single fast boot and game library drive on a fresh X670E, Z790 or newer platform, and who already has a PCIe 5.0-capable M.2 slot wired to the CPU. As a PS5 expansion drive it works mechanically, but it is overkill, and the tall heatsink may foul Sony's expansion bay cover. Direct rivals at this capacity and tier include the Crucial T700, the Corsair MP700, and the GOODRAM IRDM Pro Gen 5, all of which share the E26 platform and trade blows within a few hundred MB/s of each other.
Storage Comparisons:
C950 Performance & Benchmarks
On Klevv's official spec sheet the 1TB C950 is rated for up to 13,000 MB/s sequential read and 9,500 MB/s sequential write, with 1,300K random read IOPS and 1,400K random write IOPS. Those are fresh-out-of-box figures measured on Klevv's reference platform, and real-world numbers will depend on motherboard, cooling, and queue depth. In practice, moving a 50 GB project folder from a SATA SSD to this drive drops transfer time from minutes to seconds, and DirectStorage-enabled titles see meaningfully shorter asset load spikes.
Klevv C950 1 TB vs M.2 5.0 x 4 peers
Switch between sequential throughput and random IOPS to see how this drive stacks up against other M.2 5.0 x 4 SSDs in our database. The highlighted bar is the drive on this page — click any other bar to open that drive.
- Kioxia Exceria Pro G2 2 TB: 14,900 MB/s read, 13,400 MB/s write
- Kioxia Exceria Pro G2 4 TB: 14,900 MB/s read, 13,700 MB/s write
- PNY XLR8 CS3250 4 TB: 14,900 MB/s read, 13,500 MB/s write
- Samsung 9100 Pro 4 TB: 14,800 MB/s read, 13,400 MB/s write
- Klevv C950 1 TB (this drive): 13,000 MB/s read, 9,500 MB/s write
Two caveats are worth flagging for a 1TB Gen5 drive. First, the SLC cache is modest at this capacity, so sustained writes of more than roughly 100 to 150 GB will fall out of cache and drop to native TLC write speed, which on E26 drives typically settles in the 1,500 to 2,500 MB/s range. That only matters for video editors shoving RAW footage onto the drive for hours; for a boot and game drive it is irrelevant. Second, Phison E26 drives are genuinely power-hungry and run hot under load. The integrated heatsink is not optional decoration, and in a poorly ventilated case the controller will throttle, dragging sequential throughput back toward PCIe 4.0 levels. Independent reviewers of E26-based drives from multiple brands consistently find this same thermal behaviour, not just on Klevv's unit.
Klevv C950 vs Competitors
See how the C950 stacks up against other M.2 5.0 x 4 drives in our database:
Compare with rival drives:
Endurance, TBW & Warranty
Klevv rates the 1TB C950 at 700 TBW (terabytes written) of endurance and backs it with a 5-year limited warranty, whichever comes first. For context, 700 TBW equals roughly 380 GB of writes every single day for five years, which is far beyond what a typical boot and game-library drive will ever see. A real-world consumer workload of 20 to 40 GB of daily writes would exhaust the endurance rating in decades, not years. The drive also carries a 2 million hour MTBF figure, which is a population-reliability statistic rather than a per-unit lifetime promise, so read it as Klevv stating the platform has been validated to that reliability tier, not that any individual drive will run for 228 years. Klevv's warranty is handled through the retailer where the drive was purchased or directly via Essencore (Klevv's parent) RMA, depending on your region. Save the proof of purchase, since TBW-based warranty denials are the most common reason an otherwise-functional Gen5 SSD is rejected on claim.
Klevv C950 1 TB Specifications
| Category | Value |
|---|---|
| Capacity [?] | 1 TB |
| Interface [?] | M.2 5.0 x 4 |
| Controller [?] | Phison PS5026-E26 8 Channel |
| Memory type [?] | Micron 232-L TLC |
| DRAM [?] | Yes |
| Read speed (MB/s) [?] | 13000 |
| Write speed (MB/s) [?] | 9500 |
| Read IOPS [?] | 1300000 |
| Write IOPS [?] | 1400000 |
| Endurance (TBW) [?] | 700 |
| MTBF (million hours) [?] | 2000000 |
| Warranty (years) [?] | 5 |
Verdict: Is the C950 Worth It in 2026?
The Klevv C950 1TB is the right pick for a builder who has a free PCIe 5.0 M.2 slot on a modern AMD or Intel platform, wants a single fast drive for OS plus a game library, and prefers the convenience of a pre-mounted heatsink over sourcing one separately. Skip it if your motherboard only supports PCIe 4.0, since the drive will run at Gen4 speeds and you will have paid a Gen5 premium for nothing. The most direct alternative is the Crucial T700 1TB, which uses the same Phison E26 silicon, ships at similar sequential speeds, and is often easier to find in stock, plus the GOODRAM IRDM Pro Gen 5 if you want a European alternative at a comparable tier. For most buyers in 2026, this drive makes sense only if you are already invested in a Gen5 platform and want one drive to carry you through the next console and GPU generation.
+ Pros
- 13,000 MB/s rated sequential reads
- Phison E26 with DRAM cache buffer
- 5-year limited warranty
- Pre-installed aluminum heatsink included
- 700 TBW endurance rating
- Microsoft DirectStorage support
- Cons
- 1TB is the slowest capacity in the line
- Tall heatsink fouls PS5 bay cover
- Needs a PCIe 5.0 platform to be worth it
- Power-hungry under sustained load
Buy this or similar SSD Storage:
Video Review
🔥#techtalk : Just upgraded to a Klevv NVMe 2 TB and it's the peak of gen three! #ssd #nvme #pc
