The best card in the world will run like crap if you don't have other decent hardware to back it up, so we really need to see a list of what your computer has for hardware to give you a good answer.
8 gb 1333 memory
GIGABYTE GA-990FXA-UD3 AM3+
500 Segate hardrive
500 w Raidmax modular power supply
What does resolution mean again? How big the screen it is or how detailed the monitor is? Its 24 inches and I am pretty sure it is a full hd monitor