Corsair AX1200i 1200W preview: First digitally controlled power supply for high-end desktops

The Corsair AX1200i power supply isn't just any power supply; it's the first PSU for high-end desktop PCs to incorporate a digital controller. The DSP is supposed to ensure extremely high efficiency and very low ripple values. It also comes with interesting features such as the ability to monitor and adjust vital parts of the PSU with software.

Traditional power supplies have analogue components for regulating the voltages, in order to keep the efficiency as high as possible. Corsair is the first to implement a DSP (digital signal processor) in a desktop PC power supply. Corsairs claims a DSP is faster and more accurate, which should result in extremely low ripple values. The manufacturer promises ripple values less than a third the size of the maximum ATX specifications (40mVtt instead of 120mVtt). ATX specs also indicate that voltages can deviate by a maximum of five per cent, but Corsair has lowered that to 1.5 per cent. Stable voltages makes a PC run more steadily.

The faster and more accurate working of the DSP along with the absence of various analogue components also lowers the amount of energy consumed by the PSU itself. The AX1200i is 80 Plus Platinum certified, but Corsair claims that the power supply is more efficient than (almost) any existing 80 Plus Platinum models. We will put that claim to the test.

The Corsair AX1200i has a single 12V rail that can supply 100.4A. That effectively means that the power supply can deliver its entire capacity on the 12V rail, if needed. For the 3.3 and 5V rails, the limit is 30A. As expected it comes with modular cables, a total of 12 molex, 16 SATA and six 6/8 pin PEG connectors, all of which are nicely sleeved. Corsair even includes a small case for storing any unused cables. You can read the rest of Corsair AX1200i 1200W preview on