Tom's Hardware > Forum > CPU & Components > CPUs > Booting without a 3 pin fan

Booting without a 3 pin fan

Forum CPU & Components : CPUs - Booting without a 3 pin fan

Tom's Hardware: Over 1.4 million members in 6 different countries available to answer all your high-tech questions. Sign up now! Its free!
Ask the community Add a reply
Word :    Username :           
 
Blockoland   04-25-2003 at 02:40:30 PM

I bought different 2 x 80mm fans to replace the 60mm cpu fan. After testing them both, one seemed much quieter than the other - however, it uses a 4 pin molex connector, and doesn't have speed sensing so my pc won't boot. I can't find any option in the bios to disable the protection.

Any way around besides connecting the other fan to cpu fan header?

Cheers

Add a reply
Sponsored Links
Register or log in to remove.
sturm   04-25-2003 at 03:39:47 PM
- 0 +

You might see if there is a 4 pin to 3 pin converter. But be carefull becuase most fans with 4 pins are 12 volts while the 3 pins are a less. Dont want to overload the MB. Not sure if the rpm sensor will work with the adapter. They dont cost that much so if it doesnt work your not out a lot of money.
Only other thing I can think of is to try plugging the old fan in the 3 pin an secure it safely. But then you wont have any warning if the cpu fan does die.

Reply to sturm
Teq   04-25-2003 at 04:06:09 PM
- 0 +

3 wire fans are 12volt fans just like the 2 wire ones. In fact they are often the same fan just with a different wiring harness...

A far smarter strategy would be to temporarily hook up a 3 pin fan to the motherboard, get into the bios hardware monitor and disable the fan monitoring so that the quieter fan can then be run from the molex drive connector.


--->It ain't better if it don't work<---

Reply to Teq
Soulprovider   04-25-2003 at 10:21:07 PM
- 0 +

Usually you'll find the CPU fan boot detection option in the power management section of the BIOS

<b>Vorsprung durch Dontwerk</b>.....<i>as they say at VIA</i>

Reply to Soulprovider
Blockoland   04-26-2003 at 05:00:34 PM
- 0 +

Lol, I already tried the obvious! :D My Bios doesn't give any such options under power management, so I just bought a nice quiet 3 pin fan.

Cheers

Reply to Blockoland
LumberJack   04-26-2003 at 05:14:52 PM
- 0 +

Try in system health settings. What is your mobo?



To err is human... to really screw things up you need a computer!

Reply to LumberJack
Blockoland   04-27-2003 at 01:53:33 PM
- 0 +

Shuttle MK32N with latest BIOS revision

Reply to Blockoland
Grub   04-28-2003 at 02:48:41 PM
- 0 +

This is kind of out there...but...Fans generate their speed signal by producing a half-square wave output that is proportional to their Speed. Its kind of like the distributor on your car...at a certain point in its rotation, it will pass a coonductor through a magnetic feild and...voila...a pulse is produced. If you can find a way to simulate that then you have you speed sensor.
Does your PS fan have a speed sensor? IF so you could hook that up...or replace your PS fan with one that does. Sorry about the lack of good suggestions... there's not much you can do if your bios won't help, and none of your fans have the speed outputs.

Any man can withstand adversity...The true test of character is to give a man power <i>Abraham Lincoln</i>

Reply to Grub
LumberJack   04-28-2003 at 06:02:05 PM
- 0 +

Yeah my friend has done that.. you go to the store electronics store... buy a crystal oscilator and stick it in. Typically these have too high of frequencies, but you can buy a flipflop ic and divide it down...

This is far to complex for such a simple problem. I say find another fan with a rotational reading and stick it in there, or try going through your bios again...



To err is human... to really screw things up you need a computer!

Reply to LumberJack
Ask the community Add a reply
Tom's Hardware > Forum > CPU & Components > CPUs > Booting without a 3 pin fan
Go to:

There are 1020 identified and unidentified users. To see the list of identified users, Click here.

Forum map
Bestofmedia Forum ©
2000-2009 Bestofmedia Group
Page generated in 0.253 seconds
Please mind

You are about to answer a thread that has been inactive for more than 6 months.
If you still wish to proceed, please ensure that your posting is original and does not duplicate or overlap any prior responses to this thread.

Add a reply Cancel
Sponsored links
  • Ask the community now
  • Publish
Ad
Related Topics
See all relatives topics
They won a badge
Join us in greeting them