Motherboard and PSU

dtranftw

Estimable
Nov 8, 2014
11
0
4,560
0
Hi my motherboard has a 24 pin powerpin but my psu only has 20 so will it work or do i have to get a new psu
 

turkey3_scratch

Estimable
Herald
Jul 15, 2014
571
0
5,210
90
It really will work. 3 of those 4 pins are 3.3V, and the other is -12V. The -12V rail is not even used these days, and the 3.3V primarily is important to memory. So yes, plugging in just 20 pins will indeed work. The extra 4 pins are there just to comply with the old standards, because back in the day everything ran on 3.3V, it used to be like 12V. That is why there are so many 3.3V wires on the 24-pin ATX cable.

What does concern me is that your PSU may be an older design with little potential on the 12V rail and more capability of higher current on the 3.3V and 5V rails. I mean, it'd be a really old unit if this was the case. What is your exact unit?
 
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