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ATX power supply voltage tolerance PDF Print E-mail

The power supply in a PC supplies various voltages to internal devices in a computer via power connectors. These voltages don't have to be exact but they can only vary up or down by a certain amount, called a tolerance.

If a power supply is providing the parts of a PC with a particular voltage outside of this tolerance, the device(s) being powered may not work properly or at all.

Below is a table listing the tolerances for each power supply voltage rail according to Version 2.2 of the ATX Specification

Voltage RailToleranceMinimum VoltageMaximum Voltage
+3.3VDC ± 5% +3.135 VDC +3.465 VDC
+5VDC ± 5% +4.750 VDC +5.250 VDC
+5VSB ± 5% +4.750 VDC +5.250 VDC
-5VDC (if used) ± 10% -4.500 VDC -5.500 VDC
+12VDC ± 5% +11.400 VDC +12.600 VDC
-12VDC ± 10% -10.800 VDC - 13.200 VDC
 
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