What could kill a single CPU core

[Poncho]

Hi. I had one of my cores die a couple of days ago. It was an i5-6500 overclocked to 4.4GHz, it had run stable with this OC for over half a year and it was always well cooled, even under load. It died while I was asleep, there was no significant load on it. I've never had PSU issues before. Cores 0, 2 and 3 are perfectly fine. Could a power surge have done it? But that hasn't happened before and I'd imagine it would cause more damage. Am I just wildly unlucky?

[slightlyjaded]

What could kill a single cpu core... Overclocking...

 

Okay every single core on your computer can be overclocked to varying degrees. What is a stable overclock on most cores might be just stable enough on that one core on your cpu that isn't quite as good.

[Owlman]

-bump

[genexis_x]

Why overclock a locked CPU

Full specs?

[Technomancer__]

2 minutes ago, ZM Fong said:

Why overclock a locked CPU

Full specs?

how can you even do than

[79 Potatoes]

8 minutes ago, Ethocreeper said:

how can you even do than

Probably those "old" skylake BIOS that would let you OC anything

[Poncho]

27 minutes ago, slightlyjaded said:

What could kill a single cpu core... Overclocking...

 

Okay every single core on your computer can be overclocked to varying degrees. What is a stable overclock on most cores might be just stable enough on that one core on your cpu that isn't quite as good.

So that would then fall under the "wildly unlucky" category, given that I managed to pick just the right clock speed and therefore sufficient voltage to kill a core after the cpu had run stable for 6 months, almost 24/7. FeelsBadMan

 

12 minutes ago, ZM Fong said:

Why overclock a locked CPU

Full specs?

Because you can? A locked CPU can potentially have the same capabilities as an unlocked CPU, given that Intel decides on which CPU to unlock based on how hard it won the silicon lottery and because the market demand for locked CPUs is far higher than for unlocked CPUs ..

 

i5-6500

MSI Z170A PC MATE

8 GB Kingston HyperX Fury

Gigabyte HD 7950

550W Seasonic 80+ Bronze PSU

 

[slightlyjaded]

7 minutes ago, Poncho said:

So that would then fall under the "wildly unlucky" category, given that I managed to pick just the right clock speed and therefore sufficient voltage to kill a core after the cpu had run stable for 6 months, almost 24/7. FeelsBadMan

 

Because you can? A locked CPU can potentially have the same capabilities as an unlocked CPU, given that Intel decides on which CPU to unlock based on how hard it won the silicon lottery and because the market demand for locked CPUs is far higher than for unlocked CPUs ..

 

i5-6500

MSI Z170A PC MATE

8 GB Kingston HyperX Fury

Gigabyte HD 7950

550W Seasonic 80+ Bronze PSU

 

I think you answered my response in the second part of your post. It is possible to oc a "locked cpu" Intel bins these things pretty thouroughly however. You managed to OC a CPU that conventional wisdom said an unlocked cpu could OC safely by about 20% by 31-16% and you're wondering why it died?

 

I'm just wondering why it didn't die sooner.

 

Case in point. I have a lovely cpu that if I switch off every single core bare one I have a golden core capable of 5.2 GHZ...If I can cool it enough, and using the other 7 cores as a heat sink... Am I nuts enough to run it that high even on a cpu that is capable out of the box of a 50% overclock? Are you freeking mental I'd prefer to spend my money on things far more cost effective....Like cocaine.

[Jumper118]

How don't you mean it died? Like it doesn't show up at all or it doesn't oc. 

46 minutes ago, slightlyjaded said:

What could kill a single cpu core... Overclocking...

 

Okay every single core on your computer can be overclocked to varying degrees. What is a stable overclock on most cores might be just stable enough on that one core on your cpu that isn't quite as good.

It wouldn't kill the core at all if it's at safe voltage. It's either defective power delivery or core on the cpu

 

31 minutes ago, ZM Fong said:

Why overclock a locked CPU

Full specs?

Why wouldn't you lol. Free performance is free whether it's locked or unlocked. 

 

29 minutes ago, Ethocreeper said:

how can you even do than

Bclk overclocking. It's artificially limited on most locked Intel cpus. But you can use old microcode on skylake that hasn't got it limited. 

[Jumper118]

3 minutes ago, slightlyjaded said:

I think you answered my response in the second part of your post. It is possible to oc a "locked cpu" Intel bins these things pretty thouroughly however. You managed to OC a CPU that conventional wisdom said an unlocked cpu could OC safely by about 20% by 31-16% and you're wondering why it died?

 

I'm just wondering why it didn't die sooner.

 

Case in point. I have a lovely cpu that if I switch off every single core bare one I have a golden core capable of 5.2 GHZ...If I can cool it enough, and using the other 7 cores as a heat sink... Am I nuts enough to run it that high even on a cpu that is capable out of the box of a 50% overclock? Are you freeking mental I'd prefer to spend my money on things far more cost effective....Like cocaine.

The frequency of a cpu has 0 affect on its life span

[slightlyjaded]

Just now, Jumper118 said:

The frequency of a cpu has 0 affect on its life span

It has a lot of effect if you go past it's limits.

[Poncho]

7 minutes ago, Jumper118 said:

How don't you mean it died? Like it doesn't show up at all or it doesn't oc. 

57 minutes ago, slightlyjaded said:

It died as in memtest86 runs fine with every other core but core 1 which freezes instantly upon starting the test, and when I try to boot any OS with core 1 enabled I get a boot loop, while having it disabled results in a successful boot.

[slightlyjaded]

Just now, Poncho said:

It died as in memtest86 runs fine with every other core but core 1 which freezes instantly upon starting the test, and when I try to boot any OS with core 1 enabled I get a boot loop, while having it disabled everything works fine.

If I had to guess you've dented your cpu. You already know the solution. just disable the core.

[Poncho]

1 minute ago, slightlyjaded said:

just disable the core.

Would if I could, sadly the BIOS only allows me to choose how many cores to run (1, 2, 3, ALL), but not specifically which cores. It enables them in a numerical succession so I can only run core 0. So the real solution is to drill a hole in it and use it as a keyring..

[Jumper118]

13 minutes ago, slightlyjaded said:

It has a lot of effect if you go past it's limits.

There isn't a limit. This is literally the dumbest thing I have seen all day

[slightlyjaded]

Just now, Poncho said:

Would if I could, sadly the BIOS only allows me to choose how many cores to run (1, 2, 3, ALL), but not specifically which cores. It enables them in a numerical succession so I can only run core 0. So the real solution is to drill a hole in it and use it as a keyring..

Pick your poison. You could run it single core with just core 0 active. Or replace the cpu and choose this as a good time to upgrade. (like most of us need a reason)

I will just say that OCing is always a risk. This might not be the reason here, but maybe it finally got loaded up enough.

 

I could be wrong and I'm full of shit like jumper thinks, but he doesn't have a solution either so you're entitled to your opinion good sir.

[Jumper118]

14 minutes ago, Poncho said:

It died as in memtest86 runs fine with every other core but core 1 which freezes instantly upon starting the test, and when I try to boot any OS with core 1 enabled I get a boot loop, while having it disabled results in a successful boot.

Rma the cpu. That core is clearly defective. It should still be well within warranty. 

[slightlyjaded]

Just now, Jumper118 said:

There isn't a limit. This is literally the dumbest thing I have seen all day

Sure there is. Pick your limit. heat, voltage, stability. All of them are limits, and pushing past any of them can damage hardware. Stability is probably the one that takes the most testing.

 

Following your logic I'm sitting on a 6GHz cpu I just need to raise the Base clock enough.

[Poncho]

Just now, Jumper118 said:

Rma the cpu. That core is clearly defective. It should still be well within warranty. 

It had a one year warranty which luckily for my local reseller expired a couple of months ago so, nah, it's gonna be a dent in the wallet for me.

[slightlyjaded]

Just now, Jumper118 said:

Rma the cpu. That core is clearly defective. It should still be well within warranty. 

Are you mental? You cahnge the frequency then your warranty is void. Intel can replace the cpu at their discretion...

 

However intel does operate a performance tuning plan

 

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

 

Did you by chance purchase this before OCing? Intel may RMA an overclocked cpu that dies later, however it is at their discretion.

[slightlyjaded]

Just now, Poncho said:

It had a one year warranty which luckily for my local reseller expired a couple of months ago so, nah, it's gonna be a dent in the wallet for me.

most intel cpu's have a 3 year warranty with the manufacturer. just in case you're lucky but check previous post.

[Jumper118]

4 minutes ago, Poncho said:

It had a one year warranty which luckily for my local reseller expired a couple of months ago so, nah, it's gonna be a dent in the wallet for me.

Its oem not retail? 

[Jumper118]

3 minutes ago, slightlyjaded said:

Are you mental? You cahnge the frequency then your warranty is void. Intel can replace the cpu at their discretion...

 

However intel does operate a performance tuning plan

 

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

 

Did you by chance purchase this before OCing? Intel may RMA an overclocked cpu that dies later, however it is at their discretion.

They can't tell you oced it lol. You can rma a delided cpu. A machine can't tell how it died. It can only tell if it's functional or not. 

[Poncho]

2 minutes ago, Jumper118 said:

Its oem not retail? 

I'm not entirely familiar with the nomenclature. I'm pretty sure this counts as retail, it was a boxed processor. I think the retailer offered a specific warranty but I guess I could contact Intel directly?

[slightlyjaded]

Just now, Jumper118 said:

They can't tell you oced it lol. You can rma a delided cpu. A machine can't tell how it died. It can only tell if it's functional or not. 

So... There's nothing in the cpu to tell them what the last active settings are?

 

As I said before the RMA on any modified processor is at intel's discretion. I'm sure it's a sliding scale...Hello I just delidded my cpu, and cooled it, and it died at stock it's 2 weeks old... pretty sure that's a RMA.

 

Hello I've got a cpu I was running under LN2 at 6 GHz and I'm a famous OCer with millions of followers...That's a RMA as well.

 

Hello I'm joe bloe and nobody knows me and I've got a year old cpu that just died when I've been OCing it all year.... I'm pretty sure intel doesn't give a damn.