CPU Over Voltage Error

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simmedia

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Aug 28, 2015
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I recently got a CPU Over Voltage Error after I installed a graphics card. The PC was working before installing the graphics card. In fact, I just shut down the PC minutes before I installed it. Now, I get this error even when the graphics card is removed.

Note: the CPU is not overclocked.

Here are the things I did to troubleshoot so far:
- Reseat RAM and graphics card
- Replacing the CMOS battery
- Update BIOS to latest version

CPU: Intel Core i5-4590
RAM: Corsair Vengeance 1600MHz DDR3 4GB (x2)
GPU: Gigabyte GeForce GTX 770 4GB
PSU: Corsair CX750M 750W
MOBO: ASUS B85M-G
 
Solution
scuzzycard
PSU looks fine from here. It's giving the motherboard 12 volts like it's supposed to - and the motherboard stepping that down to 4 instead of 1.8. The motherboard is what you need to replace.
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simmedia

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Aug 28, 2015
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I found out that when I exit the BIOS it boots to Windows normally. But when I restart the PC the same error appears. I tried stress testing my CPU using prime95 the system looks fine.

Now, the only way I can get past the CPU over voltage error is to exit the BIOS.
 
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scuzzycard

scuzzycard

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Feb 26, 2016
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Vcore is not the issue, Vccin is. This is the 1.8Xv line that the CPU uses to give itself core voltage / uncore voltage/ system agent voltage / etc. /et. al.

What does AIDA64 say, as HWMonitor sometimes misnames these values?

CPUs have been damaged by Vccin above 2V, and even people running liquid nitrogen don't go above 2.8V.
 
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scuzzycard

scuzzycard

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Feb 26, 2016
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If your CPU is still alive a month from now, it's most likely a sensor. I would try to get the motherboard replaced, because if it really is feeding your CPU FIVR 4V, you're going to be out ~$200. It's up to you to decide whether or not you want to take that chance.
 
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simmedia

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Aug 28, 2015
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OK I'll try to contact Asus if I can still get warranty for my motherboard. If not I'll just get a new one.

I just do hope replacing the motherboard would fix this and that it isn't the power supply.

Thanks for the help.
 
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simmedia

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Aug 28, 2015
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I have a question about the CPU voltage. Does the CPU burn out immediately at 4 volts?

I want to know if it was the sensor on the motherboard that's broken or the power supply because I do not have a second power supply to test with.
 
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simmedia

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Thanks. I'll be replacing the motherboard then. I'll let you know when this fixes it.

Again huge thanks.

 
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