I have a WDC WD10-EZEX-60M2NA0 installed in my PC, its a 1TB hdd and i am getting read speed averaging 60mb a sec and around 38 write speed, the write speed i dont really mind but its the read speed that i notice when playing games, when i play games you can tell when its loading a new chunk of it etc the game drops in fps for a bit, its quiet annoying, i am sure the hdd is plugged into a SATA 3 but if there is some way to check by typing something into the computer i would gladly check