Two i7 4770K failures in a month

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mjanek20

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Nov 5, 2015
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Hi,

I've just stumbled across the thread:

http://www.tomshardware.co.uk/answers/id-2498520/dead-4790k.html?572c66a511f64=reload

i7 4770K
GA-Z87X-UD3H
Corsair RM 750

I have exactly the same situation as described here. To put it chronologically.

1. PC failure (no boot, turns on for a split second and off again, exactly like in a thread above)
2. Motherboard changed to new one - no fix exactly the same behaviour
3. PSU changed to new one - no fix exactly the same behaviour
4. CPU changed to i7 4790K - FIX MACHINE WORKS

5. CPU undervolted to decrease heat to 1.2V (from the auto of 1.43V)
6. Super stable system

-- 3 weeks passed --

7. PC failure (no boot, turns on for a split second and off again, exactly like in a thread above)


What the hell is wrong ?? A new MB and a new PSU, why two i7 died on me in a month time ?
 
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4Ryan6

4Ryan6

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Apr 14, 2002
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Did you also undervolt the 4770K?

Undervolting may seem like an energy saving thing to do or a heat lowering thing to do but it can actually contribute to failure it is exactly the reverse principal of overclocking and not supplying enough voltage for the CPU to run completely error free stable.

A CPU has to have a certain amount of voltage to properly operate and if you are not overclocking it is best to leave those settings alone especially when you are not even 100% certain you did not seriously destabilize the CPU with your undervolting in the first place.

Simply put a 4790K is like having a Ferrari that you treated like a Volkswagon Beetle.

You would have been better off to have left the voltage automatically controlled and gotten better CPU cooling if you were concerned about the heat.

 
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mjanek20

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Nov 5, 2015
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No, 4770K run properly for a 2.5 years without any modifications before the failure. I did undervolt because my motherboard was giving it ridiculous voltage basing on the specifications I've found online. The CPU was running super hot with the AUTO setting 1.43V - 95 degrees Celsius in stress. I have a good amount of cooling - Thermalright Macho and those temps were simply unbearable. Hence the undervolt.
 
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lodders

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Nov 2, 2015
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Stock voltage for my 4690k was 1.05V
I am now running 1.09V overclocked with the stock cooler. Peak temperature is 76°C on 100% load.
I don't think that 1.2V is an undervolt....
However, lots of people are running Haswell CPUs at 1.2V or 1.3V without any problems using aftermarket coolers.
Your motherboard should not apply 1.43V automatically - that is waaay too much. I wonder if any of the other motherboard voltages are also too high - causing damage to your CPU?
Maybe your BIOS needs updating?
 
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4Ryan6

4Ryan6

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FYI: The 4790K is actually overclocked out of the factory door and it runs hot, but it needs a certain level of voltage to run stable and that is automatically supplied by the motherboard.

If you are not overclocking it past it's factory clocks why are you running stress tests forcing load temperatures you will never come close to reaching with normal use?

I really think there is more going on here than you are fully revealing?

 
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4Ryan6

4Ryan6

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That's a good 700mhz OC for your 4690K clocked out the door at 3.5ghz, his OCd 4790K is clocked at 4ghz out the door.

When you overclocked your 4690K to 4.2ghz did you take full BIOS manual control over the overclock?

 
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mjanek20

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Nov 5, 2015
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@Ryan
Who told you I was running stress tests? Gaming made the CPU 95 celsius hot ;)
Do you have any information that can actually help me?

@lodders
The next BIOS after the one I currently have is a beta. I'm not so sure about the update. Do you think it's a good idea?

What I'm mostly concerned about is if I return the 4790K that I have and get it replaced will the new one also die in a month time.
I would search for the cause elsewhere but there is nothing more to it. MB - replaced, PSU - replaced. Can my USB connections causing anything, my Case, my cooler ... ??
 
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lodders

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I wouldn't use a beta version BIOS.
I would check the voltages for the memory, the VRin etc are all normal.
I would check that the motherboard is not shorting against the case.
Does the CPU cooler vibrate abnormally?
 
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4Ryan6

4Ryan6

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You did!

No, 4770K run properly for a 2.5 years without any modifications before the failure. I did undervolt because my motherboard was giving it ridiculous voltage basing on the specifications I've found online. The CPU was running super hot with the AUTO setting 1.43V - 95 degrees Celsius in stress. I have a good amount of cooling - Thermalright Macho and those temps were simply unbearable. Hence the undervolt.
Click to expand...

 
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lodders

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Intel CPU undervolt and underclock automatically whenever the CPU is at low load. It happens on all computers, yours is probably doing it now.
My CPU is running at 800Mhz and 0.9Volts at the moment. This is normal, and you can't destroy a CPU by doing it.
CPU are often destroyed by overvoltage.
They could be destroyed by overheating, but they have built in protection (throttling) to prevent this from happening
 
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4Ryan6

4Ryan6

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If you have overclocked and left all those Intel features enabled in the BIOS, it should protect itself the way you describe, but that is not the only way to overclock, because mine is not dropping down as you say, and I am overclocked to 5ghz.

You are overclocking well on the conservative side, but I am not, I run all my cores pedal to the metal, and strictly control my voltage supplied to the CPU.

In the OPs case neither of us know exactly how he set his BIOS settings to undervolt the CPU, think about that.

 
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4Ryan6

4Ryan6

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@mjanek20, I seriously doubt your motherboard set a solid auto 1.43v voltage you may have seen a spike to 1.43v to keep the CPU stable but that is only a spike.

Seeing as how no one here knows exactly how you had setup your BIOS settings for the undervolting only you really know what you did.

 
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mjanek20

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Nov 5, 2015
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Ok, this is not what killed the first CPU as it was not tampered with. I'm trying to find another reason for why the CPUs keep dying in my system recently. It's definitelly not the undervolt.
 
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