I bought a new SSD, the Crucial 128GB m4. According to AS SSD Benchmark it can have 415 MB/s read and about 175 MB/s write.
I have an Asrock X58 Extreme Mainboard with 6 onboard SATAII connectors. So I thought I need a SATAIII Controller, so I bought and Asrock SATAIII PCIe Controller.
Now the speed on the SATAIII is much too slow, 150 MB/s read, 105 MB/s write. I've installed the latest drivers from Asrock.
When I plug the SSD into the on board SATAII Controller I have 360 MB/s read and 175 MB/s write speed.
What is wrong with it? Why is it not performing as it should?