advice on undervolting fans

jmalco · 27 Jun 2007 at 17:25

CAN ANYONE OUT THERE GIVE ME ANY ADVICE ON UNDERVOLTING CASE FANS

AND CAN THIS BE DONE IN BIOS IF FANS ARE CONNECTED TO MOTHERBOARD

THANKS

fester · 27 Jun 2007 at 18:15

Fan voltages go like this.

Normal speed 12volt yellow 12v wire and black ground wire are used by the fan.

Medium speed 7 volt yellow wire 12v and red 5v wire are used by the fan.

Slow speed 5 volt red 5v wire and the black ground wires are used buy the fan.

You can change the values by pulling the pins out of the fans molex connector and swapping places.

WARNING DO NOT TOUCH THE PSU'S CONNECTORS.
WARNING DO NOT TOUCH THE PSU'S CONNECTORS.
WARNING DO NOT TOUCH THE PSU'S CONNECTORS.

good luck

jmalco · 27 Jun 2007 at 18:25

fester said:
Fan voltages go like this.

Normal speed 12volt yellow 12v wire and black ground wire are used by the fan.

Medium speed 7 volt yellow wire 12v and red 5v wire are used by the fan.

Slow speed 5 volt red 5v wire and the black ground wires are used buy the fan.

You can change the values by pulling the pins out of the fans molex connector and swapping places.

WARNING DO NOT TOUCH THE PSU'S CONNECTORS.
WARNING DO NOT TOUCH THE PSU'S CONNECTORS.
WARNING DO NOT TOUCH THE PSU'S CONNECTORS.

good luck [/QUOTE

THANKS FOR REPLY & ESPECIALLY THE WARNING PART , SO IF I WAS TO UNDERVOLT TO 7V , WHEN I DO THIS ARE ALL PINS SWAPPED ABOUT OR ARE THERE ANY NOT REQUIRED ECT..........

JUST WANT TO BE SURE

P.S I TAKE IT YOU CANT DO THIS FROM BIOS

MikeHunt79 · 27 Jun 2007 at 18:42

jmalco said:
I TAKE IT YOU CANT DO THIS FROM BIOS

Depends on yer motherboard. DL speedfan and try it, it may or may not work.

PS. Ever heard of caps lock

Snapshot · 27 Jun 2007 at 18:52

The Abit AB9 can do this to a certain extent but most BIOSes don't have nimble enough fingers to swap the wires around.

jmalco · 27 Jun 2007 at 19:04

MikeHunt79 said:
PS. Ever heard of caps lock

Rings a BELL !!!!!..........Is that anywhere near number lock

fester · 27 Jun 2007 at 22:04

THANKS FOR REPLY & ESPECIALLY THE WARNING PART , SO IF I WAS TO UNDERVOLT TO 7V , WHEN I DO THIS ARE ALL PINS SWAPPED ABOUT OR ARE THERE ANY NOT REQUIRED ECT..........

JUST WANT TO BE SURE

P.S I TAKE IT YOU CANT DO THIS FROM BIOS[/QUOTE]

For 7 volt You would swap the black wire the fan is using to where the red wire is.So the the fan is using the two outside pins.

For 5 volt swap yellow with red.

jmalco · 27 Jun 2007 at 22:42

fester said:
For 7 volt You would swap the black wire the fan is using to where the red wire is.So the the fan is using the two outside pins.

For 5 volt swap yellow with red.

Will give that a go..........Thanks again for your info