I am concerned because it says it needs a 500w power supply, and I just meet that minimum. Will I have a problem running it on that? I understand the Antec is reliable enough, but if it is just at 500W will it cut it? (I am not planning on OC'ing the card).
Also, is this a good choice for an upgrade. I was thinking about going with something with 2g ram, but this seems like one of the best cards for the money. (I am looking for something under $250.
Which antec 500W PSU are we talking about here? They have several options, most of which are fine for a GTX 560, i would only be slightly concerned if you had one of the ones that is 3-5 years old. The minimum is a suggestion, if you have it it will work fine, its a worst case scenario deal, and most systems are not the worst case scenario for a PSU.