Translated with GOOGLE
In the two Asus instead the difference between H57 and H55 are 11 Watt + 3 Watt ..... 11 Watts the difference between H57 and H55 and the difference between size 3 Watt mATX and ATX form factor
Original message in Italian.
Nelle due Asus invece la differenza tra H57 e H55 sono 11 Watt + 3 Watt ..... 11 Watt la differenza tra H57 e H55 e 3 Watt la differenza tra formato mATX e formato ATX
Thanks, that is exceedingly useful info. 11 watts is nothing to sneeze at, though perhaps 3 watts is.
Did you know that the H55 can talk to hard drives and SSDs only using IDE as opposed to ACHI. You need to go to the H57 to get this capability. Though I would guess that most builders of H55 board must add the capability in anyways (though probably at the cost of a few watts)
Now I need to translate this info into intelligent buying decisions.