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SanDisk X400 1TB SATA III SSD Review

By: Jon Coulter | SSDs in Storage | Posted: May 26, 2016 5:50 pm
TweakTown Rating: 93%Manufacturer: SanDisk

Final Thoughts




SanDisk's X400 surprised us with its excellent performance. What we like most about the X400 is how it stands out as a top performer when running moderate workloads. We feel that moderate workloads best represent a typical user environment. We attribute the X400's moderate workload prowess directly to its superior 4K random read performance. It's not often that we see a planar TLC-based SSD capable of delivering over 10,000 IOPS at 4K QD1 read.



The X400 is the first SSD we've tested that is powered by Marvell's 4-channel 88SS1074 controller, and we are impressed with the performance it can generate when paired with quality TLC flash. SanDisk's proprietary nCache 2.0 speeds things along while at the same time extending the endurance of the drive's TLC flash array. Additionally, we are impressed by the X400's sustained write transfer performance - in fact, it's tops for a planar TLC-based SSD.


Selling for a scant $220 at Amazon, we are hard pressed to find any SSD that's a better overall value at a 1TB capacity point. ADATA's SP550 960GB can be had for $10-$15 less, but overall its performance is well below that of the X400, its warranty period is only three years, and it is 40GB smaller in capacity. Mushkin's MLC-based Reactor at the 1TB capacity point is currently selling for the same price as SanDisk's X400 1TB, however, the Reactor cannot match the X400's moderate workload performance, endurance, or its five-year warranty.


Running SanDisk's X400 as our OS disk was a pleasurable experience. The drive is responsive, boots like lightning, and handles multi-tasking with ease. Overall, the X400 1TB SATA III SSD delivers a best-in-class SSD experience.


All things considered, SanDisk's X400 1TB SSD in our opinion delivers the best price to performance ratio of any SATA III SSD currently on the market. SanDisk's X400 1TB SATA III is TweakTown recommended.




  • Low Cost
  • Moderate Workload Performance
  • Random Read Performance
  • Five-Year Warranty




  • Random Write Performance
  • Sequential Write Performance

Product Summary Breakdown

TweakTown award
Quality including Design and Build90%
General Features92%
Bundle and PackagingN/A
Value for Money98%
Overall TweakTown Rating93%

The Bottom Line: With performance rivaling that of many MLC-based SSDs and priced at an eye-popping $220, SanDisk's X400 1TB SSD delivers incredible value.

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