I am building my own PC for the very first time and i chose out my parts and the only thing i'm unsure about is the power supply. I am not sure how powerful it needs to be. Also i want to be sure that all my parts are compatible with each other. Thanks in advance. Here are my parts: AMD Phenom II X6 3.2GHz Black edition Intel 40 GB Internal SSD NZXT Tempest EVo ATI Radeon HD 5970 Asus Crossahir IV Formula + OCZ Gold 8GB RAM Barracuda HDD 1TB Also if some of these parts aren't good of they could be repaced with something better please let me know. And if I am missing anything important.