High input Voltage CPU 3.5 V ?

February 19, 2016 at 13:50:25
Specs: Windows 7
So today i decided to install my new PSU and Graphic card. When i try to start the computer I'm welcomed by an "CPU Over Voltage Error !". so i check the monitors and my input voltage is red http://imgur.com/QBUf9Pl [1] . Tried Cmos reset by removing the battery and holding the powerbutton, resetting bios. Also i unplugged the new PSU and card and connected the old psu, still the same error. Here are my parts http://pcpartpicker.com/p/PXVzBm

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#1
February 19, 2016 at 16:57:28
These posts should help:

http://www.computing.net/answers/cp...

http://www.tomshardware.com/answers...

http://www.tomshardware.com/answers...

There are other similar posts on this Forum as well.


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#2
February 19, 2016 at 17:48:20
Could be a faulty power supply. Did you plug the 4-pin (or 8-pin) ATX12V plug into the board? The connector is just behind the PS2/USB ports.

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#3
February 20, 2016 at 00:35:13
I scoured the internet for this problem but never found that second link, thank you Jennifer. Unfortunately, there are no conclusions in the other 2, even tho one is marked as solved, no solution in those two.

I thought it was a power supply problem aswell riider, but after plugging my old psu back in, the problem is still there. Yes, i plugged in the ATX cable in the board, its an 8 pin.

So far, i don't think it is a power supply problem, more that something bad happened when moving my motherboard, or some issue that i can't figure out.

thanks for your help so far and sorry for the late answer, had to get a few hours of sleep. My dillema is now this: should i manually try to change the input voltage (assuming that is possible) and see if the problem continues or i shouldn't risk it ? Any other suggestions ? Thank you in advance


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Related Solutions

#4
February 20, 2016 at 06:38:11
Do you have any idea which BIOS is on the board? I checked the Asus site & there have been 20 BIOS updates since the initial release (version 0310 in 2013). If the board has been sitting in a warehouse for a long while, it might have an old BIOS version.

Starting with version 0805 (2014), this comment is included in the BIOS description: "Before using the new Intel 4th Gen Core processors, we suggest that you first download the BIOS updater for new Intel 4th Gen Core Processors and then update the BIOS using this tool."

So if your board is running an old version, I suggest up update it to the latest - version 2003 (2015). These links should be direct downloads:

BIOS Update Tool

BIOS version 2003


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#5
February 20, 2016 at 09:50:24
I used the motherboard for 2-3 years before without a problem. This problem happened after i moved it to a new case and installed the new psu and graphic card. I tried to start the computer today and look at the voltage and temperatures. And i had to promptly turn it off, because the temperature (according to hwmonitor) was around 100° C on the motherboard and voltage was really high. So the problem really seems to be with the mobo. I'm going to connect it to some older hw tomorrow and test it.

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#6
February 20, 2016 at 11:12:59
It appears you have a volt/temp reporting problem. There's no way your CPU would run at 100C. Intel lists a tcase temp of 72.72C. If you're not running the latest BIOS, I would definitely update it. It might correct the sensor readings. Another possibility is that you did something wrong when putting the board in the new case. Maybe a standoff is shorting the back of the board?

http://ark.intel.com/products/75048...

message edited by riider


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#7
February 21, 2016 at 13:54:48
I made a reddit thread about this here https://www.reddit.com/r/techsuppor...

I tried running it with just the necessities and while i was not doing anything the PC was pretty much fine. But after opening a web browser the temperatures skyrocketed to the 90-100 on all cores. I also checked the standoffs and the motherboard, not really finding anything. I'm going to try and update the bios, but taking a few minutes for it to cool down in case the temperatures are correct.


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#8
February 22, 2016 at 21:05:24
In moving the motherboard you may have nudged the CPU heat sink and the thermal bond between the CPU and the heat sink was broken. Remove the heat sink, remove all of the thermal compound and replace with the proper amount of new compound. Please see the link for proper instructions:
http://www.arcticsilver.com/methods...

You have to be a little bit crazy to keep you from going insane.


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#9
February 23, 2016 at 03:24:58
That does not explain the wrong input voltage Fingers. No amount of cooling and thermal paste will keep 3,5 V in reasonable temperatures. I updated my BIOS and tried lowering the voltage manually with interesting results. When i set the input voltage to 1.2 the voltage changed to 2.4 (i think it was this, have to check again when i get home). Leading me to believe that capacitor is busted maybe by the new psu. The problem now is to localize where, because voltage regulations are both on the motherboard and the cpu. I found this page https://theforevernoob.wordpress.co... to check the voltages, but the risk of destroying it completely by my shaky hands during measuring is not worth it yet i feel. Gonna look if i still have warranty on my motherboard and bring my CPU to a friend to test if it is working correctly. The cause of this is still a mystery so I think i will return the PSU just in case.

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#10
February 23, 2016 at 14:47:35
You have to be sensible. Your processor will not run at 100C; the built-in thermal protection circuitry will automatically shut it down before it gets that hot. However, there is no protection from over-voltage. A processor designed to run at approximately 1.2v will not run at 3.5v; it will fry instantly. Since your processor isn't shutting down & it isn't frying, the logical conclusion is that both the voltage & temperature readings are being incorrectly reported.

Did you update to the BIOS I supplied in response #4? Hopefully you did it correctly by preparing a USB flash drive & booting off it, just as it's explained in the manual on page 103 of 136. You should NOT use EZFlash.

ASUS H87-PLUS Manual

BTW, you should not trust software for temps & voltage readings unless you've confirmed that the software readings jive with the BIOS readings. If you want to use monitoring software for an ASUS board, you should use ASUS software:

Direct Download - ASUS Probe II Sense Driver V1.0.1.0

message edited by riider


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