Alright, so I'm sure some are aware I've been wandering around looking for stuff for my computer. And I know what I need, but i've come to the part where I dont know what to get. I've been searching NewEgg for PSU's that are in the range of 50-60 dollars that has at least 450W and 32 amps on the 12V Now, some of them seem sot have 2x 12v's which are 18a each, and I dont know if that's good for my upcoming video card. The requirements for it are 450W and 32A on the 12V. I've found one that has 34A on the 12V somewhere, but I cant find it, I do see alot of PSU with 2 12vs with weaker Amps. Do I add both 12v's? For example.This PSU that I found has: +3.3V@30A, +5V@50A, +12V1@18A, +12V2@18A, -12V@1A, +5VSB@2.5A Does that mean 36A in total?? And can somebody give me a good explanation on Rails and Amps and PSUs in general? EDIT: I found the one I wanted, but i still want a lesson or explanation on the different between 2 rails and one. What's better and what's not. etc. This is what i was looking for.