I would recommend a more powerful card because you have such a powerful processor. At least a 7770 and more like a 7850 or 7870.
Also, you should use two sticks of RAM to take advantage of dual channel mode.
Yeah, but before that i should get a better psu.. That could be in christmas or so...
And also i was thinking in upgrading my PC by buying another 4 gb stick ram..
For now, ill stay with the 7750 .