Case fan control
in [Abit]
|
From: Wes Newell on 15 Sep 2007 01:25 On Fri, 14 Sep 2007 21:24:47 -0500, VanguardLH wrote: > "Wes Newell" wrote in message news:v8DGi.1334$re2.1007(a)trnddc02... >> >> It doesn't matter if it has 2 or 3 wires. The third wire is just a >> speed >> indicator. What matters is if his MB has speed control support for >> the >> header he's plugged into. It can control the speed of a 2 wire fan >> just >> like it can a 3 wire fan. And it does do this with voltage changes. >> The >> only difference is that you obviously won't be able to monitor the >> speed >> of the 2 wire fan. Now if you don't believe that, just cut the third >> wire >> and hook it up to a speed controlled header and try it. I just >> finished >> doing it to be sure I wasn't going crazy after reading your very >> convincing BS. > > The 3rd wire is for speed *sensing*, yes. How do you know if changing > the duty cycle on the fan has reduced speed unless you can actually > measure it? Only the voltage is changed. You may have a duty cycle in a PSU, but these simple dc fans just need standard dc voltage. And it's easy to tell if the speed has changed. you can hear it, see it, and feel the airflow. > If you change the duty cycle from 100% to 50%, there may Sorry, I just don't have time to read any more of your BS. I simply wanted to point out your mistake about not be able to control the speed of a 2 wire fan. If you want to discuss the workings of a DC motor find someone that has time to explain it to you or search the web. > Personally I don't see much of a point in regulating the speed of the > fan if you can't actually see what IS the speed of the fan so the 3rd I'm not surprised.:-) -- Want the ultimate in free OTA SD/HDTV Recorder? http://mythtv.org http://mysettopbox.tv/knoppmyth.html Usenet alt.video.ptv.mythtv My server http://wesnewell.no-ip.com/cpu.php HD Tivo S3 compared http://wesnewell.no-ip.com/mythtivo.htm
From: Folk on 15 Sep 2007 12:18 On Sat, 15 Sep 2007 11:08:07 -0500, "VanguardLH" <VanguardLH(a)mail.invalid> wrote: >No matter what you think should be available via the motherboard's >super I/O or uGuru chips for regulating your fan's speed, it certainly >appears it won't work with a 2-wire fan. Rather than spending more >time on trying to solve an unsolvable setup, get a $10 3-wire case >fan. I agree. I've ordered a proper 3-wire case fan. It should be here on Wed. I'll report back. Thanks for taking the time to reply.
From: Folk on 20 Sep 2007 21:41
On Sat, 15 Sep 2007 12:18:39 -0400, Folk <Folk(a)folk.com> wrote: >On Sat, 15 Sep 2007 11:08:07 -0500, "VanguardLH" ><VanguardLH(a)mail.invalid> wrote: > > >>No matter what you think should be available via the motherboard's >>super I/O or uGuru chips for regulating your fan's speed, it certainly >>appears it won't work with a 2-wire fan. Rather than spending more >>time on trying to solve an unsolvable setup, get a $10 3-wire case >>fan. > >I agree. I've ordered a proper 3-wire case fan. It should be here on >Wed. I'll report back. Thanks for taking the time to reply. With a 3-wire case fan the system properly controls the fan speed. |