It explains write speed differences, see http://www.anandtech.com/show/8747/samsung-ssd-850-evo-review/8 http://www.anandtech.com/show/8747/samsung-ssd-850-evo-

It explains write speed differences, see http://www.anandtech.com/show/8747/samsung-ssd-850-evo-review/8 http://www.anandtech.com/show/8747/samsung-ssd-850-evo-revie... for example, bigger drives support faster writes. Though 10 times slower speed should be more than what is explainable by that.