So I have an ULTRA LSP Series V2 550W PSU, and so many people have told me it just *has* to be replaced that I went ahead and bought a CX430. It's enough voltage for my system, but do I even need it? I can't find a JohnnyGuru on my ULTRA, and I just ran the Batman: Arkham City Benchmark and it never faltered. Am I missing something Should I return the Corsair one when it gets here (still shipping)? I am very confused about the whole thing, and since I don't know how to test my PSU, I can't tell if I've made a mistake. Any help appreciated.