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SanDisk X400 256GB SSD Review

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The Sandisk X400 uses a 2.5in, 7mm format chassis and weighs in at 37.4g (59.7g for the 1TB version).

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It measures 100.5 mm x 69.85 mm x 7 mm.
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The PCB for the 256GB model is very small not even reaching half way along the enclosure. A thermal pad very nearly covers the whole area of the PCB keeping two NAND packages, the controller and the cache IC cool. The PCB is held in place by a couple of screws – undoing these reveals another two NAND packages on the reverse side of the board.
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The four NAND packages are SanDisk’s own 15nm TLC NAND coded 05478064G. The cache chip is a Micron 256MB DDR3L-1600 package.

At its heart of the X400 is a Marvell 88SS1074-BSW2 four channel controller. Marvell’s fifth generation SSD controller is built on a 28nm process and supports up to 15nm TLC/MLC/SLC NAND as well as 3D NAND. It also supports DEVSLP, ONFI 3/Toggle 2, 256-bit AES encryption and TCG Opal 2.0 support.

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