Originally Posted by Atomic Rooster
So, which are the "less important" rails and how are they beefed up?
the 12v rail is the most important rail, that pretty much makes the 3.3v and 5v rails the "less important" rails, correct...? or am I wrong here...?
this is taken from About.com which pretty much parrots everything I've ever heard about psus and their specific rails...
The most important voltage rail in a power supply is the +12V rail. This voltage rail supplies power to the most demanding components including the processor, drives, cooling fans and graphics cards. All of these items draw a lot of current and as a result you want to make sure that you purchase a unit that supplies enough power to the +12V rail.
With the increasing demands on the 12V lines, many new power supplies have multiple 12V rails that will be listed as +12V1, +12V2 and +12V3 depending on if it has two or three rails. When calculating the amps for the +12V line, it is necessary to look at the total amps produces from all of the 12V rails. Often times there might be a footnote that the combine maximum wattage will be less than the total rating of the rails. Just reverse the above formula to get the maximum combined amps.
* Amperage = Wattage / Voltage
here's the link...
About.com: PC power supply wattage
the two psus have the exact same number of 12v rails
and the exact same wattage on those rails
, care to guess where the extra watts on the Antec come into play...?
Originally Posted by hedoe
gentlemen (i guess)
keep it clean
if you look at the specs in the Atomic Roosters post that you quoted
you will see the differeance between those 2 PSUs
and i dont mean the wattage either
compair the +3.3V and the +5V rails
and you will see what he means
if you have ten 5 dollar bills and I have seven 10 dollar bills, who has more money...?
the Antec has more amps on the 5v rail and the Thermalake has more on the 3.3v rail, thus Antec gets to claim more wattage even though those watts are not as important as the 12v rail...
also, you might want to read this, it's a good (but maybe biased) article about some myths concerning psus, like "it's better to have multiple 12v rails instead of one with a lot of amps", plus, it mentions one of the problems with having a modular psu...
Power Supply Myths Exposed