5V regulation
Cross-loads are harder for a PSU to deal with because voltage is being concurrently applied to different rails at one time. Think of it as loading up your CPU, graphics and peripherals all in one go - a worst-case scenario.
Cross-load 1 puts almost all almost of the capacity down the other lines whilst cross-load 2 hammers the 5V line but just tickles the others. Whichever the case, the Corsair does well from a regulation point of view.