Hello guys i recently got an Acer Veriton S680G PC that has: an Intel Core i5 750 @2.7Ghz, 4 GB RAM and a terrible Nvidia Quardro FX 580 that i can't run any games on. Im looking for a good Gaming Graphics card that isn't too long, dosn't require and external power and doesn't exceed 300w. The PSU is not upgradable because it uses Acers special type.