KLEVV CRAS C910 4TB vs Western Digital WD Blue SN5000 4TB
At least one of these has no price the site currently tracks, so what follows weighs specifications alone.
| Specification | KLEVVCRAS C910 4TB | Western DigitalWD Blue SN5000 4TB |
|---|---|---|
| Capacity (GB) | 4000 | 4000 |
| Sequential read (MB/s) | 5200 | 5500better |
| Sequential write (MB/s) | 4800 | 5000better |
| Current best price | — | 442,97 €at Amazon.es · captured 2026-09-13 |
| Price per TB | — | 110,74 € |
| Endurance (TBW) | 1400better | 1200 |
| Warranty (years) | 5 | 5 |
| DRAM cache | No | No |
| NAND type | tlc | qlc |
| Controller | — | Western Digital in-house Polaris 3 (4-channel, HMB) |
How these two compare
Sequential throughput
KLEVV CRAS C910 4TB states 5200 MB/s read and 4800 MB/s write; Western Digital WD Blue SN5000 4TB states 5500 MB/s read and 5000 MB/s write, both over PCIe. Sequential numbers like these describe large sustained transfers; the responsiveness you notice day to day tracks random access more closely than the peak figures do.
Random access
KLEVV CRAS C910 4TB is rated 540.000 IOPS random read and 600.000 random write; Western Digital WD Blue SN5000 4TB, 690.000 and 900.000. Random 4K access — many small, scattered operations — is what a drive does booting, launching apps and juggling everyday tasks, and it tracks that feel far more closely than the sequential figures above.
Endurance
KLEVV CRAS C910 4TB is rated for 1400 TBW and Western Digital WD Blue SN5000 4TB for 1200 TBW — the total the maker warrants you can write over the drive's life. A typical desktop writes only a few terabytes a year, so either rating is many years of headroom; the figure matters mainly as a relative signal of how hard each is built to be driven.
DRAM cache
On the cache question: KLEVV CRAS C910 4TB is DRAM-less, and Western Digital WD Blue SN5000 4TB is DRAM-less. The DRAM keeps the flash-translation table close, sparing a lookup on nearly every access; a drive without it leans on host memory or its own flash, which usually shows as slower sustained random writes rather than in the headline sequential numbers.
NAND, controller and warranty
On the flash itself: KLEVV CRAS C910 4TB uses TLC, and Western Digital WD Blue SN5000 4TB uses QLC. NAND tiers count bits per cell — more bits pack more capacity into the same silicon but shorten write endurance and slow sustained writes, which is why QLC sits below TLC on lasting performance even when the sequential numbers match. Controller: KLEVV CRAS C910 4TB's controller is not stated and Western Digital WD Blue SN5000 4TB uses the Western Digital in-house Polaris 3 (4-channel, HMB). The controller runs wear-levelling, error correction and the mapping table, so it shapes sustained and random behaviour as much as the flash does — though the model name alone predicts little without testing. KLEVV CRAS C910 4TB carries a 5-year warranty and Western Digital WD Blue SN5000 4TB carries a 5-year warranty — the length the maker will stand behind the drive, and usually a proxy for the endurance it is rated to.
Which to buy
The site holds no current price for at least one of these, so it cannot call the buy on cost. Judge them on the specifications above — at the same capacity and interface, two drives usually part on things like the DRAM cache, the NAND tier, endurance and warranty, so weigh whichever of those the sections above report.
Common questions about this pair
- Which is faster, KLEVV CRAS C910 4TB or Western Digital WD Blue SN5000 4TB?
- KLEVV CRAS C910 4TB states 5200 MB/s read and 4800 MB/s write; Western Digital WD Blue SN5000 4TB states 5500 MB/s read and 5000 MB/s write, both over PCIe. Sequential numbers like these describe large sustained transfers; the responsiveness you notice day to day tracks random access more closely than the peak figures do.
- How do KLEVV CRAS C910 4TB and Western Digital WD Blue SN5000 4TB compare on random access?
- KLEVV CRAS C910 4TB is rated 540.000 IOPS random read and 600.000 random write; Western Digital WD Blue SN5000 4TB, 690.000 and 900.000. Random 4K access — many small, scattered operations — is what a drive does booting, launching apps and juggling everyday tasks, and it tracks that feel far more closely than the sequential figures above.
- Should you buy KLEVV CRAS C910 4TB or Western Digital WD Blue SN5000 4TB?
- The site holds no current price for at least one of these, so it cannot call the buy on cost. Judge them on the specifications above — at the same capacity and interface, two drives usually part on things like the DRAM cache, the NAND tier, endurance and warranty, so weigh whichever of those the sections above report.