So as you can see, I have a 460w PSU and I wanted to replace my GTX 660 1.5GB to the GTX 760 2GB but the problem is that it requires a minimum of a 500w PSU, so my question is can I run this card with my actual PSU or do I really need to replace it to a 650w or a 700w PSU? And also what would happen if I don't changed it? My PC crashes, it explodes, it burns or what?