The rate is on a Asrock Extreme9 and TI USB 3.0 chipset, which allegedly supports UASP ok, but not under Win8 x64 exhilarating. Test SSD Corsair Performance Pro 256GB was.
approximately 250MB / s read, 150MB / s write (sequential).
But what annoys me properly, is the poorly built USB socket. It is installed offset to the housing neck, so that the cable must be plugged in almost diagonally and with gentle force. USB-A plug "is" on the housing fully on. The existing leverage is also not ideal for a long service life with safety. So either filing or return ...