How Much Power Do You Really Need For Your PC?
 

I am not trying to convince anyone to ditch their large PSUs in favor of smaller and more efficient units. My (green-ness) usually ends with putting plastic bottles in that special recycling box. All I am saying is - don't take things for granted.

http://overclockers.com/articles1452/

Same difference in putting premium 93 Octane gas into a Honda Civic.... making the driver feel good ;)