# 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.

Quick answer: 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.

## Specifications

| Specification | Value |
| --- | --- |
| Capacity | 1 TB |
| Interface | M.2 5.0 x 4 |
| Controller | Phison PS5026-E26 8 Channel |
| Memory type | Micron 232-L TLC |
| DRAM cache | Yes |
| Sequential read | 13000 MB/s |
| Sequential write | 9500 MB/s |
| Random read IOPS | 1300000 |
| Random write IOPS | 1400000 |
| Endurance | 700 TBW |
| MTBF | 2000000 |
| Warranty | 5 years |

## Performance

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.

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.

## 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.

## Pros and Cons

**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


## Verdict

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.

## Frequently Asked Questions

### Is the Klevv C950 1TB good for gaming?

Yes. With 13,000 MB/s sequential reads, 1,300K random read IOPS, and Microsoft DirectStorage support, the 1TB C950 handles DirectStorage-enabled AAA titles, fast level loads, and high-bandwidth asset streaming without breaking a sweat. The honest caveat is that most current games still load off PCIe 4.0 drives in similar real-world time, so the visible gain over a good Gen4 SSD is modest today and will only matter as more titles ship with DirectStorage pipelines. Pair it with a modern CPU and a Gen5-enabled GPU to actually realize the benefit.

### Is the Klevv C950 1TB compatible with the PS5?

Mechanically it works, because Sony's expansion bay accepts any M.2 2280 NVMe SSD that meets the published spec, and the C950's read speed far exceeds Sony's recommended 5,500 MB/s floor. The practical problem is the pre-installed heatsink, which adds height and may foul or prevent the PS5's expansion-slot cover from sitting flush. If you can confirm the heatsink fits inside Sony's 11.25 mm height envelope, it will work; otherwise consider a bare Gen4 drive instead, since the PS5 cannot use Gen5 bandwidth.

### Does the Klevv C950 have a DRAM cache?

Yes. Klevv's spec sheet lists an embedded DRAM cache buffer on every C950 capacity, including the 1TB model. The DRAM is used by the Phison E26 controller to store the flash translation layer and accelerate random access, which is one of the reasons the drive sustains better real-world performance than DRAM-less HMB designs under mixed workloads. Klevv does not publish the exact DRAM size, but the E26 platform on a 1TB drive typically pairs with 1 GB of LPDDR4.

### What is the TBW endurance of the Klevv C950 1TB?

Klevv rates the 1TB C950 at 700 TBW (terabytes written). That figure scales with capacity across the line, with the 2TB at 1,400 TBW and the 4TB at 3,000 TBW. At a typical consumer workload of 20 to 40 GB of writes per day, 700 TBW represents decades of use, so endurance is not a realistic concern for a boot or game-library drive. Heavy video-edit workloads that write hundreds of GB per session will eat into the rating faster, but still far slower than the warranty term.

### Does the Klevv C950 1TB need a heatsink?

It already includes one. Every C950 ships with Klevv's duotone aluminum heatsink plus a stabilizing protective base, and on a Gen5 drive this is not optional decoration. The Phison E26 controller runs hot under sustained load and will throttle aggressively without adequate cooling, dragging sequential throughput back toward PCIe 4.0 levels. The trade-off is that the bundled heatsink is tall (17.8 mm with heatsink), so confirm it fits your motherboard's M.2 slot clearance and any adjacent GPU backplate before buying.

### Is the 1TB C950 slower than the 2TB or 4TB versions?

Yes, moderately. Klevv's spec sheet rates the 1TB at 13,000 MB/s sequential read and 9,500 MB/s sequential write, while the 2TB and 4TB both reach 14,000 MB/s read and 12,000 MB/s write. Random IOPS are also slightly lower on the 1TB (1,300K read versus 1,400K on the larger SKUs). This is the standard pattern for E26 drives: more NAND packages on the larger capacities give the controller more parallelism to work with. The difference is measurable but rarely visible in everyday use.

### How does the Klevv C950 compare to the Crucial T700?

They are very close on paper, since both use the Phison E26 controller, target PCIe 5.0 x4, and land within a few hundred MB/s of each other at the 1TB capacity. The Crucial T700 1TB is rated at 12,400 MB/s read and 11,800 MB/s write with optional heatsink, while the Klevv C950 1TB is rated at 13,000 MB/s read and 9,500 MB/s write with a heatsink always included. The Crucial has wider retail availability and a longer review track record; the Klevv ships with cooling as standard and is often picked by builders who want a single-SKU solution.

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Last updated: 2026-06-25. Source: https://ssdrive.net/klevv-c950-1-tb