What Makes A Good Power Supply? Well the Republic of Gamers might not make PSUs, but we do recognize a good one keeps the rest of your PC happy while the high efficiency keeps the power bills down on that quad-GPU rig. If you've never really given them much thought though, Toms Hardware has a very useful foundation guide to start you off, explaining the differences in form factors, power rails, connectors and compatibility and even certifications to look for. Even if you're not new to building PCs, but still want a kick ass 2012 gaming and overclocking rig, this guide can definitely help fill in a few gaps.