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PSU Rail Draw

D

dd0512

Limp Gawd
Joined
Jun 14, 2009
Messages
145
Ok, so like when you look at a PSU's spec sheet, for example a single rail one, and maybe we've got say 100W on the 3.3 & 5 volt rails and 400W on the 12V one.

Is any of the 100W available to the 12V rail or is it somehow reserved for just 3.3 and 5?
 
That depends on the way the PSU is designed. However, if the PSU label provides a definite maximum current or power output for the +12V rails, then that is the hard limit. If the PSU you're talking about is rated for 400W on the +12V rail, then you should not exceed that amount regardless of the amount of load on the +3.3V and +5V rails.
 
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