Amazing. It worked. I did the things you said, changed the port form A_1 to B_0, turned off power management and turned on SMART. Now its super fast. https://postimg.org/image/vqkpyddw7/
I have no idea why it worked, but hey
it worked. Thanks a bunch mate.
P.S how can I select your answer as the right one?
There is no `pick as the solution'.