I recently purchased a Sandisk Extreme 240GB SSD. The advertised speeds are 550 MB/s read and 520 MB/s write, but I seem to only be getting 393 read and 405 write. Can anyone explain to me the issue? The drive is connected to the sata 3 port and is on a 6gb/s cable. I have an ASRock extreme4 motherboard, 3570k, 16gb of RAM, and no HDD connected at the current time. I also have the ASmedia SATA 3 driver installed, and have tried to install Intel RST, but don't know if it improves performance as i can't get it to start. Everytime I install a version above 11.2, I get a crash with an error message. I can get it working on 11.2, but the drive isn't even recognized in the program. I guess my questions are: Why are my speeds slow, how do I improve them, am I missing any drivers (I have chipset drivers installed), and is RST necessary for better performance?