A way to remove Dell's fan lock?

DavidVioMC · May 22, 2016

I got a Dell Optiplex 960 SFF PC based. I game a lot on it and reaches high temperatures, not dangerous temperatures but high, I want to control the fans but programs like SpeedFan ect don't work because Dell has a lock to prevent people turning them down too much and overheating theirs system, I do have an option in BIOS to make the fans run at full speed all the time but they are way too loud, I can't use a fan controller because Optiplex don't start if a fan is faulty/unplugged. I contacted a local IT shop and they told me that they are not sure if this is possible but the fans should increase speed if I unplug one of the two heat sensors, so I did and sure enough, the fan speeds increased but only by like 600 RPM which is nothing. Is there a way to remove the lock?

clutchc · May 22, 2016

I don't know of any way to change that other than a firmware change. I presume that is coded into BIOS. I have a Precision T3500 that is similar in as much as fan speed is not changeable in BIOS. But I found that using HWinfo64's fan control, I can make a medium and high speed change in the speed of the 2 front case fans. You might try that and see if it helps any.

Otherwise, you may want to set the fan(s) at high speed and just use a resistor to get the speed you want.
4-pin: http://www.walmart.com/ip/47559829?wmlspartner=wlpa&adid=22222222227035163861&wl0=&wl1=g&wl2=c&wl3=75564467914&wl4=&wl5=pla&wl6=175614296674&veh=sem
3-pin: http://www.walmart.com/ip/47550995?wmlspartner=wlpa&adid=22222222227035163957&wl0=&wl1=g&wl2=c&wl3=75560496634&wl4=&wl5=pla&wl6=175604882434&veh=sem

You can sometimes find these in sets of two impedances that allow for 5v and 7v output so you can try which you like the best.

DavidVioMC · May 22, 2016

clutchc :

I don't know of any way to change that other than a firmware change. I presume that is coded into BIOS. I have a Precision T3500 that is similar in as much as fan speed is not changeable in BIOS. But I found that using HWinfo64's fan control, I can make a medium and high speed change in the speed of the 2 front case fans. You might try that and see if it helps any.

Otherwise, you may want to set the fan(s) at high speed and just use a resistor to get the speed you want.
4-pin: http://www.walmart.com/ip/47559829?wmlspartner=wlpa&adid=22222222227035163861&wl0=&wl1=g&wl2=c&wl3=75564467914&wl4=&wl5=pla&wl6=175614296674&veh=sem
3-pin: http://www.walmart.com/ip/47550995?wmlspartner=wlpa&adid=22222222227035163957&wl0=&wl1=g&wl2=c&wl3=75560496634&wl4=&wl5=pla&wl6=175604882434&veh=sem

You can sometimes find these in sets of two impedances that allow for 5v and 7v output so you can try which you like the best.

Thanks a lot, didn't know something like this exists, I will give it a try.

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A way to remove Dell's fan lock?

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