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CPU Died. wonder why?! Haswell 4670k undervoltage fail

post #1 of 15
Thread Starter 
I bought a used 4670k replacing my G3258.
Worked great, overclocked to 4.3 @ 1.20- 1-25v about. My MoBo is a Asus H-81Mplus and also tested switching to a MSI z97 PC mate MC-4, with same result. PSU OCZ 650w 80+ Bronze

My temps were somewhat high (70C @ full load) and i had a couple bluescreens while playing DOOM multiplayer. Decided to take the clock and voltages down.
I took it down to 4.2Ghz and lowered the voltage considerably to 1.190v. I First got post screen, but upon pressing delete the computer rebooted and continued to do so over and over until i killed the psu switch. No problem I thought, I will simply remove the battery and clear CMOS. This however had no effect. I put my G3258 back in and the computer booted into windows no problem.

switching back and forth and testing all my other hardware and memory sticks in different slots and so forth, my conclusion is that the CPU is dead.
Why did underclocking the cpu permanently kill it? This seems strange, I have had problems like this when cpu failed to post with the voltage too low, and it never killed a cpu before. Anybody have similar experience and/or any possible explanations for this situation?

Thanx a bunch smile.gif
post #2 of 15
Undervolting didnt kill it. That I am 1000 percent sure of.

I think it was the asus h-81 motherboard that killed it. Its a very low end, very cheap motherboard. That motherboard was meant for basic 2 core, non OC cpu's.

Just look at the VRM on that board. Its only a weak 3 phase setup. Thats my guess. The other board though, the MSI z97, that board is fine for a quad core OC.
post #3 of 15
Thread Starter 
.
Quote:
Originally Posted by Lex Luger View Post

Undervolting didnt kill it. That I am 1000 percent sure of.

I think it was the asus h-81 motherboard that killed it. Its a very low end, very cheap motherboard. That motherboard was meant for basic 2 core, non OC cpu's.

Just look at the VRM on that board. Its only a weak 3 phase setup. Thats my guess. The other board though, the MSI z97, that board is fine for a quad core OC.

Ok thanks for the info. So you think I damaged my cpu before when it was oc and 70C?
I had that oc for weeks stresstested (a bit wink.gif) and playing csgo on it.
After the last blue screen I booted into bios no problem, and then when I restart with the under voltage, the cpu dies for good for some reason.
Any idea what happened? The board looked fine to the naked eye at least. Have had it RMA:ed presently, but expecting it to come out ok.

"very cheap MoBo", Actually they are about the same price :/ dunno why when it sux. It was "plus" something, but the cheapest H-81 boards are like half of that. Agree that the parts must be cheap or somehow underpowered.

Guess i will have to just buy a new 4690k and stick it into the z97 board. Thanx for your reply. Wish I had shopped more conciously from the start.
Rip wallet:thumb:

Edit: Wow that board dropped in price by 30% after i bought it frown.gif the jukes
Edited by veizelman - 7/14/16 at 2:09pm
post #4 of 15
Overclock at your own risk. biggrin.gif
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post #5 of 15
Thread Starter 
Quote:
Originally Posted by THUMPer1 View Post

Overclock at your own risk. biggrin.gif

I will I will biggrin.gif
More damage to be done still
post #6 of 15
70C at 1.25 volts is NOTHING! As long as your power supply is supplying clean voltage and your motherboard mosfets (VRM) are able to regulate that 12v to 1.25 cleanly without overheating, that overclock would last over a decade without needing any adjustments. You only need to worry once you take it up to 1.4+.

As for stress testing, you really dont need more than 2 hours or so of ASUS real bench. If it can pass 2 hours of that, you should be fine.

Stress testing with something like Intel burn test or lastest version of prime 95 can damage the cpu, especially intel burn test. I would personally never run that program for more than a few minutes.
post #7 of 15
Thread Starter 
Quote:
Originally Posted by Lex Luger View Post

70C at 1.25 volts is NOTHING! As long as your power supply is supplying clean voltage and your motherboard mosfets (VRM) are able to regulate that 12v to 1.25 cleanly without overheating, that overclock would last over a decade without needing any adjustments. You only need to worry once you take it up to 1.4+.

As for stress testing, you really dont need more than 2 hours or so of ASUS real bench. If it can pass 2 hours of that, you should be fine.

Stress testing with something like Intel burn test or lastest version of prime 95 can damage the cpu, especially intel burn test. I would personally never run that program for more than a few minutes.

OCCT stress test for... 10min? and then gaming to see if it will bluescreen? thumb.gif

In my experience an overclock can pass some stresstests, and be fine in all my games but if I play a specific game I will bluescreen and be forced to step back the overclock.
But usually i dont think gaming will stress the cpu more than the OCCT stresstest or similar programs

What work load temperature would you consider a maximum?

Edit: fails
Edited by veizelman - 7/14/16 at 2:56pm
post #8 of 15
Quote:
Originally Posted by veizelman View Post

I bought a used 4670k replacing my G3258.
Worked great, overclocked to 4.3 @ 1.20- 1-25v about. My MoBo is a Asus H-81Mplus and also tested switching to a MSI z97 PC mate MC-4, with same result. PSU OCZ 650w 80+ Bronze

My temps were somewhat high (70C @ full load) and i had a couple bluescreens while playing DOOM multiplayer. Decided to take the clock and voltages down.
I took it down to 4.2Ghz and lowered the voltage considerably to 1.190v. I First got post screen, but upon pressing delete the computer rebooted and continued to do so over and over until i killed the psu switch. No problem I thought, I will simply remove the battery and clear CMOS. This however had no effect. I put my G3258 back in and the computer booted into windows no problem.

switching back and forth and testing all my other hardware and memory sticks in different slots and so forth, my conclusion is that the CPU is dead.
Why did underclocking the cpu permanently kill it? This seems strange, I have had problems like this when cpu failed to post with the voltage too low, and it never killed a cpu before. Anybody have similar experience and/or any possible explanations for this situation?

Thanx a bunch smile.gif

How long did you own it? I don't want to be that guy, but there's a chance the last guy just rammed 1.50V through for a few days. frown.gif It might've already been on its way out.

I only say that because 1.20 to 1.25V is nothing on a Haswell CPU; that shouldn't do anything. Hell, most i5-4670Ks have VIDs are just a hair lower than that. And 4.3GHz is a mild overclock, too.

My last CPU did the same thing: on, off, on, off. It never even finished POST. RMA'd both the CPU & motherboard. Motherboard RMA, no issues found. Intel replaced the CPU under the overclocking warranty.
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post #9 of 15
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Quote:
Originally Posted by ikjadoon View Post

How long did you own it? I don't want to be that guy, but there's a chance the last guy just rammed 1.50V through for a few days. frown.gif It might've already been on its way out.

I only say that because 1.20 to 1.25V is nothing on a Haswell CPU; that shouldn't do anything. Hell, most i5-4670Ks have VIDs are just a hair lower than that. And 4.3GHz is a mild overclock, too.

My last CPU did the same thing: on, off, on, off. It never even finished POST. RMA'd both the CPU & motherboard. Motherboard RMA, no issues found. Intel replaced the CPU under the overclocking warranty.

well i havent owned it for long. A Month?
The guy was quite young and said he never overclocked it at all. He was almost amazed I had the balls to do it wink.gif, but buying the K version makes no sense if you dont overclock
so maybe he was being smooth...?

Regarding the mild overclock, I had serious stability issues above 4.3Ghz even at higher voltages, and I didnt like the temps moving above 80C.
Is this indicative of the motherboard having too weak components? What temp would you be comfortable pushing?

You are saying that if i buy a new 4690K, overclocking it wont void warranty?
post #10 of 15
Quote:
Originally Posted by veizelman View Post

well i havent owned it for long. A Month?
The guy was quite young and said he never overclocked it at all. He was almost amazed I had the balls to do it wink.gif, but buying the K version makes no sense if you dont overclock
so maybe he was being smooth...?

Regarding the mild overclock, I had serious stability issues above 4.3Ghz even at higher voltages, and I didnt like the temps moving above 80C.
Is this indicative of the motherboard having too weak components? What temp would you be comfortable pushing?

You are saying that if i buy a new 4690K, overclocking it wont void warranty?

Well, I don't know our situations are comparable; maybe I'm just seeing a relationship that isn't there.

The H81 is truly aimed to scrap by with as a little as possible and the K-series CPUs are truly designed around the Z-series motherboards. It could be that even a little mild overclock was too much for the motherboard and it sent out some dangerous voltages to the CPU when it shouldn't have. But, I've very little experience with H81 OCing... frown.gif

I've only heard of the H81 being used on the Pentium unlocked CPU, TBH, so I'm certainly no expert. However, for an i5-4670K, that frequency and voltage are not dangerous in the slightest.

Personally, I don't like going over 70C on day-to-day gaming & encoding.

Err, the standard warranty is void when you overclock. However, for a few years, Intel has offered a $25-30 overclocking warranty plan that gives you a one-time replacement. This is what I had and how I got the new i5-4670K from Intel, even though it'd been pretty high clocked and high volted (4.5GHz @ 1.370V for ~3 years).

https://click.intel.com/tuningplan/
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