I even had posted special topic (You know) ,"how to" differenciate good and cheap PSUs, but my topic disappeared as well as some of Yours (after updating the UBB).
Not again .... ...... ......

(hey! - half my emoticons don't work!)

Can I pick holes with you Freddy (again-sorry!) but if Asus want a 15 amp supply to the +- 12v how the f are they gonna manage that from a supply that's only 13 amp, that's not really a PSU anymore but a transduccer or whatever the hey its called as its increasing ampage....

The critical figure you quote is the 180w this is the guaranteed maintained current that the m/b needs, you don't need a 400 watt supply for that, that is the peak load it can supply not what it can maintain....

I will spell it out - a 400 watt supply means it can handle peak load of 400w without dissolving in a puff of smoke- this gives no indication of the level of maintained current the unit can supply this figure is NOTHING to do with the peak load it can carry!

That's the end of my little rant