Gonna need a bit more info on the "500W PSU" before we can say either way. If its a generic PSU, I would throw it out on general principle. If its a good model say from Corsair or Seasonic, then you will likely be fine.
I already own some of the parts. I'm going to upgrade the CPU, RAM and Graphics Card, so the specs I mentioned before will be the PC's final state. As for the PSU, it's a Chieftec GPS-500AB A
AC-INPUT: 115V~/ 10A & 220-230V~/ 5A
Yup, that's the one! So, I can use the all the components AND the GTX 560 as well without the fear of accidents? I mean, aren't I going to push the supplier to its limits? And since I can use the 560 one, the 550 is ok as well, right?
Thank you everyone for your time! I couldn't find information on that matter, and I luckily found this site! One last question. Any other graphics card upgrade after the GTX 560 will need a better PSU for sure, right?