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Should I be concerned?

post #1 of 10
Thread Starter 
I admit I made a bit of a n00b'ish mistake, despite knowing better.

Last night I began overclocking an Intel Core i5 2500K. I did a couple moderate adjustments first for testing temps and whatnot. I reached 4.2 GHz without much issue.

I decided my goal was to reach a stable 4.5 GHz, so I set my multiplier to 45, and fired up Prime95. CPU-Z showed the voltage at 1.32v (which I read was in an acceptable range for this high of an OC), temps seemed decent at first (I believe in the 60's to low 70's), so I decided to let it run overnight (total running time around 10 hours).

I woke up today, and saw all 4 worker threads were still working, so I figured everything was fine, and shut down Prime95. I realized I hadn't bothered to check what my temps were at that very time, but fortunately the program I was using (Real Temps 3.60) was still open, and showed the highest temps reached during the testing. Core 1 reached a max of 88 degrees, core 2 was 96 degrees, and cores 3 and 4 were both 98! In the "Thermal Status" section, both cores 1 & 2 had a status of "Ok" and cores 3 & 4 had a status of "Log," which made me a bit worried.

At this point, I decided to fire up Prime95 again to see what sort of load temps it would show now, and within seconds all the cores quickly rose into the 80's, so I decided to shut it down before it rose higher. That did concern me, since like I said, the night before when I first started Prime95, the temps started a lot lower (and obviously rose higher throughout the night), but now they were immediately going to the higher temps (although, the chip was likely still hot, since it had only been a few minutes since I had shut it down after the 10 hour stress test).

So, with that said, I'm wondering if there's any possibility that I may have already overdone it, letting the cores reach nearly 100 degrees for lord knows how long. However, I'm wondering why none of the worker threads stopped in Prime95, so I'm hoping that maybe things will be fine.

Anyone have any input on this (other than to be more careful, of course!)?
post #2 of 10
upto 85c is actually fine on prime, any higher for a conderable time could be harmful to the chip causing degradetion, however more than likely, with the temps that high, it must have caused the cpu to throttle but not sure as to what, could have backed down to 3.3ghz during that time which would have been better but under the circumstances not so good.

Please fill in your system spec under CP. what cooling were you using?

BTW welcome to OCN
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post #3 of 10
By the sound of it, you have only changed your multiplier and nothing else.

So you may want to manually set your VCore voltage instead of keeping it on Auto.
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post #4 of 10
It's probably fine, Intel chips are extremely hard to kill.

That said, I recently saw a 4870x2 die from 100 celcius, and my 2900xt died from hitting 120 for about 2 minutes. I know GPUs are different, but silicon chips in general will start taking some serious damage from 100-120 depending on which chip it is.
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post #5 of 10
What HSF are you using?

It sounds like your voltage is through the roof or the fan on your cooler decided to take a break in the middle of the night. Set your voltage manually and make sure your CPU fan is set up appropriately in BIOS. For the CPU fan, lower the target temperature as much as you can, and/or bump up the target fan speed to at least 50%, or however high you can make it without it sounding 24/7 like a plane taking off at La Guardia.
Edited by pnoozi - 8/17/11 at 3:48pm
    
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post #6 of 10
Thread Starter 
Wow, thanks for all the responses guys (and the warm welcome... although I've been on OC.net before, I just couldn't remember my previous login details), I do feel a fair bit better after all your feedback. I've updated my system info to include the specs of this build (which, admittedly, is not even my machine, it's one that I'm building for someone).

The most common question was what cooling I'm using, and admittedly, I "MacGuiver'd" an OCZ Vendetta 2 into this build... which some of you may recognize as being a HS for a socket 775 based mobo. I couldn't fit it on the way it was, I actually had to break out my dremel, and modify the holes that the standoffs go through (about an extra mm in each direction), and had to add a washer (which I also had to grind down to about half the original size) between the metal "legs" and the actual HS so that it would be the proper high. I only applied a thin layer of thermal compound onto the CPU heatspreader, made sure that there was a proper "footprint" made on the heatsink by installing it, and then removing it to check... so all in all, I think I did a decent job, and it should be fine. What do you guys think?

So I came home today, and have been doing a bit of tinkering. Currently, I have the multi dialed down to 40, and the CPU voltage set to 1.12v. Been running Prime for about the past hour, nearly, and my max core temps so far are 59, 61, 60, & 65 in that order... compared to the information I've been reading (which seems to be mostly for a 2600K, not a 2500K) seems to be a bit high. Overall the 4'th core seems to be consistently running hotter than the other 3 (most of the time, the 3 are running under 60, and the 4th is usually around 64)... is that normal/acceptable? Could that be because one corner of the CPU is transferring less heat to the HS (ie. might not be pressing against it as hard as the rest of the die)?

Anyways, thanks again guys. I'll check back in tomorrow to see what you all say.
post #7 of 10
Quote:
Originally Posted by DJRK View Post
(which, admittedly, is not even my machine, it's one that I'm building for someone)
Wow, I gotta be honest with ya, but if that was a build for someone other than you, I would put a new cpu in it.
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post #8 of 10
Board modifications like that would also void the warranty - I would have strongly recommended NOT trying to wedge a heatsink not usable by the mobo onto that mobo.

Enable round-off checking in Prime95 the next time you use it. Doing this will cause prime95 to kill any threads that throw errors, which will guard your CPU against doing calculations merrily without any indication that the situation is unstable.
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post #9 of 10
Quote:
Originally Posted by Quantum Reality View Post
Enable round-off checking in Prime95 the next time you use it. Doing this will cause prime95 to kill any threads that throw errors
Great tip Quantum Reality!
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post #10 of 10
Quote:
Originally Posted by DJRK View Post
Been running Prime for about the past hour, nearly, and my max core temps so far are 59, 61, 60, & 65 in that order... compared to the information I've been reading (which seems to be mostly for a 2600K, not a 2500K) seems to be a bit high. Overall the 4'th core seems to be consistently running hotter than the other 3 (most of the time, the 3 are running under 60, and the 4th is usually around 64)... is that normal/acceptable? Could that be because one corner of the CPU is transferring less heat to the HS (ie. might not be pressing against it as hard as the rest of the die)?
I think this is the natural assumption, but its not a matter of the heatsink pressing down on one side more than the other. It's that the thermal sensors are really bad for measuring accurate temperatures. Especially at idle.

I've been linking this a lot but I'll keep doing it because its great information about the DTS's in these chips.

http://www.techpowerup.com/realtemp/docs.php

The short answer is that yes this is common, in fact it is the norm... I've noticed some very specific, very interesting trend in temps by looking at the sandy stable club's spreadsheet. For example, Core 1 and Core 4 tend to be the lower temps of the 4, while Core 2 & 3 tend to agree VERY closely and be the higher temps in the group (on load around temps ~70). About 90% of sandy bridge owners on that spreadsheet have Core 1 as their lowest temp, offset by around 7C.

I'm an engineer so I notice those things .
    
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