Barty1884 said: Unless that PSU is junk, you should be fine.What PSU is it specifically? "550W Gold" doesn't mean too much, unfortunately.
Barty1884 said: Absolutely no problem at all. Upgrade away. Just make sure you're going to see a benefit fairly proportionate with the cost. If you're gaming at 1080p, a 1060 or 1070 is likely more than sufficient - although a 1080 may be beneficial if you're playing high FPS titles on 120Hz+ monitor.