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SanDisk X400 1TB SATA III SSD Review (Page 1)

SanDisk X400 1TB SATA III SSD Review

SanDisk's X400, a 1TB SSD selling for the very low price of $220 is sure to turn heads. Let's take a close look.

By: Jon Coulter from May 26, 2016 @ 12:50 CDT
TweakTown Rating: 93%Manufacturer: SanDisk



The X400 is SanDisk's tier-one client SATA SSD. The X400 is available in two form factors: M.2 2280 and a standard 2.5"x7mm cased design. Both form factors carry identical performance specifications. The 1TB M.2 X400 is advertised as the world's thinnest 1TB M.2 solution. At only 1.5mm thin, the M.2 version is designed primarily for OEM's looking for the thinnest possible SSDs for use in ultrabooks and high-performance tablets. The 2.5"x7mm version is designed as a drop-in replacement for mechanical HDDs. Both form factors are available in self-encrypting drive (SED) versions that support TCG Opal 2.0 thus maximizing interoperability with a wide spectrum of security software platforms.

The X400 pairs Marvell's TLC (Triple-Level-Cell or 3-bit per cell) specific 88SS1074 four-channel controller with SanDisk's own 15nm toggle mode planar flash. Marvell's 28nm-based 88SS1074 is loaded with features, the most important being LDPC (Low-Density Parity-check Code) error correcting code (ECC). LDPC greatly magnifies the endurance of TLC flash. In comparison to SanDisk's previous generation client TLC SSD, the X300, the X400 sports an endurance rating or TBW (Total Bytes Written) that is 300% greater; taking planar TLC from roughly 500 P/E cycles to an impressive 2000 P/E cycles. SanDisk combines their proprietary nCache 2.0 and DataGuard technologies with LDPC to produce their highest ever endurance for a client SSD. SanDisk is so confident in the planar-based TLC X400's endurance and reliability that they back the drive with a class-leading five-year warranty.

SanDisk's X400 1TB SATA III SSD has a lot going for it. World's thinnest 1TB M.2 SSD, nCache2.0, SED, DataGuard, a five-year warranty, and one of the lowest price points we've seen to date. The only thing left to determine is how well it performs. In choosing our test pool, we factored in pricing and TLC flash. Samsung's 850 EVO 1TB costs roughly one hundred dollars more than SanDisk's 1TB X400, so even though the EVO is a TLC flash-based product and the better performing SSD, we feel it is not going to be in direct competition with the X400, which is why we will not be comparing the two. We comprised our test pool of competing low-cost planar TLC solutions, albeit most are half the capacity of the X400 we are testing today; the cost per GB is similar.



SanDisk's X400 SATA III SSD is available in four capacities: 128GB, 256GB, 512GB, and 1TB. The 1TB 7mm x 2.5" cased model we have on the bench has the following factory specifications:

Sequential Read: up to 545 MB/s. Sequential Write: up to 520 MB/s. Max 4K Random Read/Write: up to 95,000/75,000 IOPS at QD32. TBW checks in at 320TB, MTBF up to 1.75 million hours. Power consumption: 70mW active, Max Read 2.85W, Max Write 4.4W, Slumber 45-52mW, DEVSLP 6-9.7mW.

SanDisk backs the 1TB X400 for five years or 320 terabytes written, whichever comes first.

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