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+12 voltage dorps to 0.12

Last response: in Components
November 11, 2011 8:18:31 AM


I have weird problem. CPU fan is at constant speed 1059, it used to adjust according to CPU temp. After observation I found that +12 voltage drops to 0.12 on some railings. CPU fan stops when it should rotate at highest speed. It is working at normal speeds when no load on CPU

More about : voltage dorps

a b ) Power supply
a c 159 à CPUs
November 11, 2011 12:07:10 PM

You are getting a bad reading for the 12v. Check the bios reading; any reading between 11.7 and 12.3 is good. For the cpu fan, your motherboard bios may have a smartfan setting which you can change, but some oem systems by dell, etc. may not be adjustable. You probably are fine. Enjoy the quiet. If you find a calibrate function in the hardware monitor section with smartfan, use it, then select "quiet" if it's an option.
a c 144 ) Power supply
a c 172 à CPUs
November 11, 2011 12:13:13 PM

If the 12 volt reading actually dropped to .12 volts, you wouldn't have seen it. Your system would have shut down.

What program are you using to monitor your voltages.
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November 15, 2011 9:14:34 AM

Mine is IBM xSeries 206. Bios is not showing any thing regarding voltages neither smartfan settings.

Previously I used to hear CPU fan zooming sound when processor is at heavy load. Since few days, there sounds are there.

I installed Speedfan a doubt in mind. It is showing 3 different blocks for voltages. In third ( last block), there are 3 readings

+3.3V: 3.28
+5V: 5.11
+12V: 0.12V

I think my PSU is wearing, please advise.
a b ) Power supply
a c 159 à CPUs
November 15, 2011 9:19:58 AM

What motherboard do you have? Is it oem by dell, hp, etc? Some boards give inaccurate readings with speedfan. The software simply doesn't work right with some boards.
a c 248 ) Power supply
a c 162 à CPUs
November 15, 2011 10:05:23 PM

Obviously your software is reading it wrong. If you 12 V rail was even at 10 V your system wouldn't be able to run, that low and your motherboard wouldn't be able to do anything.

Get yourself a digital multimeter and use it to check the voltages, since your BIOS doesn't report voltages its your only chance for accurate readings.