Did I fry my cpu :(? (increase voltage)

[Cephy]

Hello,

I recently bought the msi gtx 970 for my 3 year old rig and everything was working fine. I decided to overcloak my cpu a bit more. I had my i7 running at oc 4.1ghz for 2 years without any problems and decided to oc it to 4.5ghz. After having 2 BsoD in 2 days saying something about cpu failure I thought I give it a final try to increase the core voltage in the bios settings. I only increased the voltage by .05, saved and reset. However the pc won't boot.... my monitor doesn' power up and my mouse isn't detected. Only my keyboard power led is on so I cannot acces the bios.
The startup is also far less noisy than usual which make me believe I destroyed my hardware.

I tried to switch my psu by a older model, I tried to switch video cards, tried to use onboard video, tried to use 1 stick of ram in diffrent slots but nothing works....

Did I really destroy my cpu or motherboard by only increasing voltage by one notch?

Is there a way out?

 

[Supernova1138]

Try resetting your CMOS, you can do that by unplugging your machine and pulling the battery on the motherboard for a few minutes and then see if your system will boot when restored to default settings. As for increasing the voltage by .05, it could do damage if you were already on the maximum safe voltage at 4.1GHz, or if you have a cheaper motherboard with a not so great power delivery system.

 

[JackNaylorPE]

1st Step - Go into BIOS and restore all settings to default. That will usually get it going. If inaccessible....

2nd Step - Reset CMOS, instructions are in the manual.

Would be helpful if we knew the components involved (model numbers, brands isn't enuff) but overclocking is more than raising VCore.

0.05 volts will most times not be enough for a jump from 4.1 to 4.5 on HW or DC. And how much cooling you have is critical here. here's my thoughts:

Up to 1.200v = Very Good Air Cooler (Hyper 212)
Up to 1.250v = Best Air Coolers (Phanteks PH-TC14-PE, Silver Arrow or Noctua DH14) ....... Dual 140mm CLC / AIO Cooler w/ 1500 rpm fans (Corsair H110)
Up to 1.275v = Extreme Speed Dual Fan CLC / AIO w/ 2700 rpm fans (too noisy for most folks)
Up to 1.287v = Best air coolers (Cryorig R1 / Noctua DH-15)
Up to 1.300v = Swifteh H240-X
Up to 1.325v = Custom Loop w/ 15C Delta T (3 x 120mm / 140mm) *
Up to 1.400 = Custom Loop w/ 10C Delta T (5 x 140mm or 6 x 120mm) *

* At this level having the GPU(s) also under water is assumed

Also, if you are not running AVX, you can add as much as 0.10 to all those voltages.

From looking at OC threads, I'd estimate that on HW w/ XMP enabled, about 50% of CPUs will need....of course half do better and some do extraordinarily better

1.200v for 4.2 GHz
1.225v for 4.3 GHz
1.255v for 4.4 GHz
1.310v for 4.5 GHz
1.375v for 4.6 GHz

In addition, you will likely need to increase VCCin (eventual CPU Voltage) to the 1.85 - 1.90 range to get to 4.5 and maybe even > 2.0 for 4.6. DC does better.

 

[Cephy]

Try resetting your CMOS, you can do that by unplugging your machine and pulling the battery on the motherboard for a few minutes and then see if your system will boot when restored to default settings. As for increasing the voltage by .05, it could do damage if you were already on the maximum safe voltage at 4.1GHz, or if you have a cheaper motherboard with a not so great power delivery system.

Ty ty, this fixed the issue. I located the CMOS battery beneath my gpu. removed it for 10 minutes then replaced it again.
Everything is functional again. My bios is set to default settings.

BTW my overloack was at stock voltage. I never changed anything but the cpu ratio. Only today I added .05 voltage which neutralized my system.

So no harm done? Everything is looking fine so far.

 

[Cephy]

To add

I was dumb and didn't investigate the voltage part of the overclock enough to understand what I was doing.

What I did was going in my bios to check my core voltage cpu setting. It was set to auto, i clicked on it and there was a number highlighted in yellow something like 0.855 not realising that it was the only the current voltage used and not the normal default voltage. So what I did was add .05 to that number and saved and reset. My pc simply didn't have enough voltage to power up after that.
After discovering my true core voltage I added it up with .05 again and managed to overcloak my i73820 from 3.6GHZ to 4.5GHZ.

 

[Cephy]

I have however 2 other questions.


1 is my CPU-z is showing the incorrect cpu core speed 4300 mhz instead of 4500 mhz while my bios settings is showing 4500 mhz which one to believe?


Another really weird thing is that when I first bought the pc parts I did have corrupt corsair RAM and decided to replace it with Kingston RAM this fixed the problems and had no errors on memtest. However this was 3 years ago and I only installed CPU-z 2 days ago and when I go the RAM tab it shows at manufacturer : Corsair instead of Kingston.... what the hell?