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Crazy voltages

post #1 of 13
Thread Starter 
I have known for quite some time that my motherboard (ASUS P5N32-SLI SE DELUXE) is pretty borked, I have to either set my memory's voltage down quite a long way to run the 4-4-4-12, 800MHz memory at 5-5-5-18. 800MHz or I can keep it on its automatic voltage with 4-4-4-12 but only run it at 667MHz. My SLI is also completely crapped out so I am only using 1 of my 2 graphics cards.

Under XP (I now use Vista but ASUS don't seem to actually do any software at all that runs on Vista ) with ASUS' pc probe II, the voltages looked a little too high but nothing major, however, under linux I can see this with lm-sensors:
Code:
$ sensors
it8712-isa-0d00
Adapter: ISA adapter
VCore 1:   +1.28 V  (min =  +0.00 V, max =  +4.08 V)   
VCore 2:   +3.34 V  (min =  +0.00 V, max =  +4.08 V)   
+3.3V:     +4.08 V  (min =  +0.00 V, max =  +4.08 V)   ALARM
+5V:       +6.85 V  (min =  +0.00 V, max =  +6.85 V)   ALARM
+12V:     +12.35 V  (min =  +0.00 V, max = +16.32 V)   
-12V:      +3.93 V  (min = -27.36 V, max =  +3.93 V)   ALARM
-5V:       +4.03 V  (min = -13.64 V, max =  +4.03 V)   ALARM
Stdby:     +5.11 V  (min =  +0.00 V, max =  +6.85 V)   
VBat:      +4.08 V
fan1:     1599 RPM  (min =    0 RPM, div = 4)          
fan2:     1757 RPM  (min =    0 RPM, div = 4)          
fan3:        0 RPM  (min =    0 RPM, div = 8)          
M/B Temp:    +45°C  (low  =    -1°C, high =  +127°C)   sensor = diode   
CPU Temp:    +34°C  (low  =    -1°C, high =  +127°C)   sensor = thermistor   
Temp3:      +128°C  (low  =    -1°C, high =  +127°C)   sensor = disabled
Yesterday it was even worse:
Code:
$ sensors
it8712-isa-0d00
Adapter: ISA adapter
VCore 1:   +1.28 V  (min =  +0.00 V, max =  +4.08 V)   ALARM
VCore 2:   +3.34 V  (min =  +0.00 V, max =  +4.08 V)   ALARM
+3.3V:     +4.08 V  (min =  +0.00 V, max =  +4.08 V)   ALARM
+5V:       +6.85 V  (min =  +0.00 V, max =  +6.85 V)   ALARM
+12V:     +12.35 V  (min =  +0.00 V, max = +16.32 V)   ALARM
-12V:      +3.93 V  (min = -27.36 V, max =  +3.93 V)   ALARM
-5V:       +4.03 V  (min = -13.64 V, max =  +4.03 V)   ALARM
Stdby:     +5.11 V  (min =  +0.00 V, max =  +6.85 V)   ALARM
VBat:      +4.08 V
fan1:     1360 RPM  (min =    0 RPM, div = 4)          
fan2:     1730 RPM  (min =    0 RPM, div = 4)          
fan3:        0 RPM  (min =    0 RPM, div = 8)          
M/B Temp:    +46°C  (low  =    -1°C, high =  +127°C)   sensor = diode   ALARM
CPU Temp:    +35°C  (low  =    -1°C, high =  +127°C)   sensor = thermistor   ALARM
Temp3:      +128°C  (low  =    -1°C, high =  +127°C)   sensor = disabled
could my motherboard's borkedness be causing these sensors to lie, or could it actually be running at these voltages? I expected them to be weird but not this weird.

Every time I turn the machine on after turning it off at the mains (not just turning it off on the front of the box) I have to reboot it because it tells me that "overclocking or overvoltage failed" and when I hard reboot it with the front reboot button I have to hold down a few seconds, just tapping the button also causes this message.

I've ordered a replacement motherboard. I was going to get an asus 680i p5n32-e sli but they were "awaiting eta from manufacturer" so I ordered the striker extreme version, don't know if that was a good idea but oh well. I just want to know how broken this mobo is (if at all) before giving it to someone.
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Serene Power
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post #2 of 13
Get a oscilloscope.... or a multimeter to check.

+12v and +5v must be within 5%.
+3v must be within 4%.


On my DFI, my 12v is reported as 11.87v in the BIOS. However, a multimeter says it is 12v. I trust the multimeter.
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post #3 of 13
I think if your computer was running at those voltages, it would be on fire.
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post #4 of 13
What does your Bios say when it comes to voltages? amazed that your rig even runs with those kind of voltages.
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post #5 of 13
Thread Starter 
well, it being linux, it is conceivable that sensors-detect just got the wrong drivers or something. I don't know if it87 is correct for that mobo. The bios lists voltages as not too bad, as did windows xp, but it only shows the positive voltages and you can see that even lm-sensors is showing this at the moment: "+12V: +12.35V" which isn't too bad relative to some of the others.

The box has been running stably for almost a year now just by lowering the memory's voltage in bios. I wonder if that is some kind of record

I have a multimeter somewhere but I have no idea where to poke it at, and I don't want to short out the mobo by accident.
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post #6 of 13
Never trust software voltage readings. Invest in a multimeter.
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post #7 of 13
Thread Starter 
I have a multimeter.. i just said that..

I still know that I have a lot of weird voltages even if it isnt showing them correctly. I actually think whatever part of my motherboard that controls power distribution (does the northbridge do that?) is just faulty, which is causing all the problems I have with sli, memory and sensors. I just hope it hasn't damaged anything too much for a replacement to fix it, or if it isn't the motherboard that is broken but the psu or something, that I don't break the new one too.
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post #8 of 13
lol, that's gotta be wrong...

your pc would be in smoke by now.
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post #9 of 13
So, if the Bios readings are ok then you eighter have a serious grounding problem or the software is giving out false readings.Eighter way your system would not run when those readings were for real. So as far as I can tell the software is fooling you. If you want to use the multimeter, Rip out your PSU and measure the Molex connectors without anything attached to it. This way you won't destroy your mobo
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post #10 of 13
Thread Starter 
It's a modular psu with only 1 molex actually being used (dvd burner), the rest are pcie, 24pin, 8pin, sata etc connections. Do I just need to plug the PSU into the mains on its own and read across all of these? If I do it wrong will I break the PSU too?
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Serene Power
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