About the warranty, it says that I have to register the warranty within the first 30 days. How do I do that? If I don't, I only get two years warranty.
You go to the XFX website and it asks you for the UPC, and the date you ordered it I think. Most companies have you do this so it's a pretty standard concept. Saying that reminded me of somthing else, something was wrong with their website where you go to warranty registration and PSU's aren't listed, all I did was google something like "XFX PSU warranty" and I got it registered. Maybe they have it fixed but I didn't bother to tell them about it, so I tend to assume that no one else did either.