So I'm planning some upgrades to my build. My current PSU is a really nice modular 450W OCZ. I don't really want to have to buy a new one if I don't need to. Would 450W be able to supply an AMD Phenom 955, ATI Radeon 5850 on a mid/high-end MOBO and DDR3-1600 RAM? I'll probably do some minor OC'ing of the components as well. I did the newegg PSU finder thing, and it recommended a 550W PSU. So... thought?