I'm looking for a good mother board for a low power consumption desktop PC. I read the article in Tom's hardware comparing an Atom system with a Core 2 E7200 one that shows how this last has a better ratio performance/consumption with a 200 W PSU.
I'd like to know which are the power consumption of an Asus P5N-T Delux mobo, in particular with Linux to know if this could match my target.
I didn't even know you could buy 300W power supply anymore, much less a 200W. You might try Asus support directly with this one - giving them all the info on your proposed system.
Are you looking to see how small a PSU you can put in? A 450W PSU isn't going to draw 450W if the pieces it's powering don't ask for it. So within reasonable limits, a 450W PSU isn't using more energy than a 200W.
I wouldn't count the Asus board out because of the PSU recommendation they list. Keep in mind, they have to say this to cover the entire range of CPUs a customer might put in - not just those looking for a low-power solution. And it does seem to have very extensive control and features aiming it towards the "green" market. In addition, Asus is a much more major brand, especially in the US, than FoxConn.
Foxconn however, does have a nice manual - and apparently offer a "green PSU" to go with their Green Series motherboards. I notice they have 3 models at Newegg, but not that particular one.
There are two 2 problems.
The first is that such Asus motherboard (I like Asus mb) don't have video integrated and a graphic card could eat a lot of power and the second, general to all green motherboard, is if their greenness is in some way OS bounded, because I'd like to use (I already use it since about 15 years) Linux. So I have yet to do a lot of searches.