gui-hashcat-plus with 7970 problems

[qweasd]

Hi guys
I recently bought a brand new sapphire hd 7970 oc.
I expected to have major Performance with Hashcat.
I am posting you the image of what I am doing.

please tell me if I am doing something wrong Because I am seeing
that every one with this card, have result that measured by "M/s"
and I am seeing just "H/s" in the cmd
more loops or Acceleration making the screen to freeze

i removed every driver with Driver Fussion and installed just Catalyst 13.1

second problem is, if I am overclocking the card, even with the lowest conf in hashcat
the screen start freezing or even worse the screen shows many lines etc...

Here is my screen capture