The Samsung may also be cooler due to the lower number of platters.
The new CX series are of unknown quality, as Corsair doesn't intend for them to be reviewed. They are only 'up to 80Plus' efficient which is not good. I've read from reading forum responses, here and elsewhere, that they would probably not be able to deliver their full rated wattage at high temperatures.
Unfortunately OCUK doesn't have the Antec Earthwatts Green EA-380D, which is a very high quality power supply, would be much more efficient than a Corsair CX, and is usually around the same price as the CX430 at other online retailers.