How would you calculate the amps on 2 12v rails?

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M
P=IV
so the max power that one of the rails can handle is 12*18=216W
The 360W is the most that the power supply can give to all of the 12V rails at any given time. So even though one rail can handle 216W the power supply can't supply both rails at their maximum.
For the purposes of building a computer you want to make sure that your graphics card does not exceed 216W (you will want a decent amount of headroom I wouldn't put a graphics card that draws more than 150W on this powersupply) and that your CPU and GPU together will never draw more than 360W.
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margibso

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P=IV
so the max power that one of the rails can handle is 12*18=216W
The 360W is the most that the power supply can give to all of the 12V rails at any given time. So even though one rail can handle 216W the power supply can't supply both rails at their maximum.
For the purposes of building a computer you want to make sure that your graphics card does not exceed 216W (you will want a decent amount of headroom I wouldn't put a graphics card that draws more than 150W on this powersupply) and that your CPU and GPU together will never draw more than 360W.
 
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