Are your shopping for a new computer? If you are or just wanting to replace an old ATX power supply.... LISTEN UP!
Not many people know but your typical low end or budget ATX power supply is very inefficient in how it uses electricity. A typical 600W power supply will actually use quite a bit more then 600W in fact would draw more like 1000W if its rated 60% efficient. Thats a lot of money wasted... not to mention all the heat it generates. The additional 400W is HEAT!
There is a new generation of power supplies rated "80Plus" this means a typical 300W power supply would only draw 375W power because it is 80% efficient. Read this
Stop turning money into heat.... buy one of these 80Plus power supplies, save money on your electrical bills and reduce heat output in your computer case... your CPU will thank you.
Here is a list of manufacturers with 80Plus power supplies