The reason that Corsair's new Professional Series AX1200i is called a digital power supply is due to the presence of a digital signal processor inside the PSU.  The advantages are likely to due with the reduced complexity of the internal design than due to the DSP being a miracle, however there is more to it than just smooth voltages.  With the USB Corsair Link interface you can use the bundled software to monitor the three main voltage rails, the 24-pin connector's 12V line, the AC voltage at the wall socket and there are current trackers for all of the PCIe power connectors as well.  If you obsess over power management and happen to need more than a kilowatt of power, check out Corsair's latest offering at The Tech Report.

"Corsair's new Professional Series AX1200i uses digital circuitry to convert AC to DC power. We take a quick look at the PSU and the software enabled by its DSP."

Here are some more Cases & Cooling reviews from around the web:

CASES & COOLING