That you require a lot of power to run a computer today is a well known fact and even if we see more and more energy efficient platforms the truly extreme platforms are far from efficient. After NVIDIA and ATI both launched their multi-GPU technologies, SLI and Crossfire, which allows users to install two graphics cards in one computer the requirements for the power supply unit have been increasing steadily This has resulted in that NVIDIA and ATI have started branding PSUs with their respective multi-GPU certifications. The PSUs that can handle a Crossfire system simply gets a Crossfire Certified branding and the same goes with SLI. The question is though whether these certifications are 100% reliable and at Legit Reviews they’ve tested 8 SLI/Crossfire power supply units to see if they can live up to the requirements.
