Deve ser por causa disto:
"The Samsung 960 Pro uses the 256Gb MLC variant, which allows for a single 16-die package to contain 512GB of NAND"
http://www.anandtech.com/show/10754/samsung-960-pro-ssd-review
"The Samsung 960 Pro uses the 256Gb MLC variant, which allows for a single 16-die package to contain 512GB of NAND"
http://www.anandtech.com/show/10754/samsung-960-pro-ssd-review