Ok im thinking of using the -12v line on my PSU to double volt my fans i tested my fans with it on my work bench left em over night and they held up but im not sure if the mobo would handle the increase in amperage. I was wondering if anyone has any experience with doing this or knows exactly what the -12v line is used for on the mobo. i have few extra PSUs and motherboards well a whole stack of em kicking around that i could test with but before i go and fry a perfectly good PSU / Mobo i just wanted to get some more info. i might just mod an old AT PSU into the bottom of my case and use a relay to start it with the ATX PSU but my case is tight for space so im trying to avoid that.
![[H]ard|Forum](/styles/hardforum/xenforo/logo_dark.png){kind=logo}
double volting vans
- Thread starter potskie05
- Start date
The only reason I would do this is to use 24V fans. It's safer and cheaper to just buy better fans.
Double-volting means you're pushing the components at two times nominal and usually 7-10V higher than specified tolerances. That makes things run hotter, fail sooner, and potentially generate enough heat to catch fire.
Double-volting means you're pushing the components at two times nominal and usually 7-10V higher than specified tolerances. That makes things run hotter, fail sooner, and potentially generate enough heat to catch fire.
Im not sure what your aim is... I am guessing you want the fan fo push more air? Most modern MOBOs don't use -12v so your MOBO won't care (unless cards plugged into your MOBO use -12v). Since the -12v output from most PSUs is limited to around 1amp you will not be able to power more than 6-7 fans from it.
NickS
[H]ard|Gawd
- Joined
- Sep 22, 2005
- Messages
- 1,953
It's actually pretty safe..AreEss said:
I know ppl who have ran 80mm and smaller fans @ 24v for 1yr + w/no issues.
i know why im doing it and how it works im just not sure if the mobo will accept the large increase in amperage on the -12v line and i want to double volt my fans upto 24v because i have a super dusty room where my pc is and i put filters on the fans which caused a dramatic decrease in air flow but now my components arnt covered in dust in about a week. so im double volting them to increase the airflow through the airfilters. and to be more specific im trying to run 4 .14 amp fans my psu will support that it supports .7 on the -12v but i have no clue of what the mobo will do with the large increase.