Hi! Sorry for my bad english (I am brazilian). This SSD is a OEM model, is a “UltraII - derived” (TLC, nCache 2.0). See this japanese review: http://reviewdays.com/archives/50000 In a AS SSD image, the write speed is below… I am suppose nCache in X300 is thin (SanDisk don’t talk about size), and is flooded fast. TLC is a type of NAND when offers low write speeds. I have one SanDisk X300 128GB, and reaches 516MB/s (read) and 477MB/s (write) on 500MB test in CrystalDiskMark, and same results of your SSD in 1000MB test. My computer is a Dell Latitude E6320, ACHI mode, no IRST installed. Test your X300 (128GB ou 256GB?) with CrystalDiskMark 500MB test, and if possible, post image here. Thanks.
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