The Athlon II x4 is not recomanded for such a card , the Hd 7870-XT is basically a light version of the high end : HD 7950..and as logainofhades stated : the lack of cache will hold this card down from giving the 100% performances, the FX 4300 is another AMD AM3+ quad core that could give much better performances and FX6300 is greater choise.