Intel Burn Test

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Sturmgewehr_44

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I've been suffering from some judgement with CPU temps recently. I don't really know what to believe. I remounted my CPU cooler (Hyper 212 Evo) and applied some MX4. Anyway, my idle temps are pretty solid so I don't know why Prime 95 is giving me such high temps (Goes up to 70c on hottest core briefly after 15mins).

However, I tested IntelBurnTest yesterday. Apparently it's supposed to be "Up to 20c higher than Prime95" yet I'm seeing similar temps, and even a few Celsius better using the Maximum test, over all Prime95's various tests (including Small ffts).

After 30 minutes of running IBT Maximum, I passed two runs (each around 13mins) and my temps were a tad lower than Prime95 blend, which is contrary to what I've heard. Isn't IBT supposed to be far more unrealistic and demanding than Prime95 already is?


Anyway, how good are these temps for a stock (with Turbo 3.9ghz) i7-2700k and a Hyper 212 Evo?

Idle: http://i.imgur.com/PDPTwgT.jpg

IntelBurnTest Max: http://i.imgur.com/Yu62AfN.jpg
 
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4Ryan6


I didn't mean for it to come across as you're some kind of bad guy, I am just attempting to make you cautious running stress tests as it can affect the longevity of the CPU.

That being said, I doubt the CPU is throttling. 70c is below the Tcase, and well below the TJmax. The Thermal Limit for the 2700k is 72.6c. The TJmax is I believe 98c. Not once have I ever succeeded any of these, and if at any point I did, it would have been for a brief moment when I was Overclocked on Turbo.
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bartholomew

bartholomew

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Don't go too deep into this IBT vs P95, many users have experienced the same as you.

You're temps are fine, no worries.
 
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Sturmgewehr_44

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Ok, thanks for the reassurance. All that makes me feel a bit more secure with my system.

Are there any temperature guidelines that indicate something with P95 or IBT? Like, are my temps average or slightly above-average?

 
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Sturmgewehr_44

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I'm not sure of my room temperature. Should I find the ambient temperature??

Anyway, my Prime temps seem odd, so I guess apparently IBT is giving me better readings? I was told a few times earlier that those temps are far too high for stock. Is that possible that my CPU just doesn't work well with Prime95, but does with IBT?

I want a 4.2ghz Turbo OC (I have an Asus Motherboard). Should I be okay?

 
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bartholomew

bartholomew

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Yes, your ambient temps are important to determine in your temps are high or not.
If your ambient temps are low, then your core temps should be lower.
Case airflow is also important, you should have at least 1 or more case fans bringing in cooler outside air.

P95 is just stressing your cpu harder than IBT.
Even for me, p95, IBT, ibt avx(modified version for amd fx cpus) & OCCT all give different temps :p

Try re seating your cooler, apply a small dot(rice grain) of mx4 in the middle, place the cooler & just install it.
let the weight of the cooler spread it evenly.
also, make sure your cooler fan is running @ max speed when under load.

See, if it improves your temps.


 
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Sturmgewehr_44

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I reseated my cooler and reapplied MX4 less than a week ago. I saw a few C decrease, I think. It's most noticeable on idle, goes into the 20s now.

How do I find my ambient temperature?

Maybe I'm being stupid, but isn't Prime95 supposed to be much less demanding than IntelBurnTest??

 
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bartholomew

bartholomew

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Just take an educated guess, you don't really have to 100% accurate. If you want to be then you can buy them sensors.
I just check my hdd or cpu socket/motherboard temps, they are usually 5~10C above ambient temps, depending on case airflow.


Yes you are :D
For some its less demanding for some its the other way around. Like I said no need to good too deep.
P95 blend or IBT, both a very good stress test softwares, choose whichever you like.

stress test softwares are like a worst case scenario, your regular workloads isn't gonna push your cpu that hard.
Your temps would be lower in regular usage than what you'd see under these torture tests.
 
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Sturmgewehr_44

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I found this graph: http://i.imgur.com/ZNzz6Lg.png

It is for Haswell, which I know runs hotter. It has IBT Maximum on it. It reads a peak temperature of 83c, which is 13c higher than what I got. I assume the CPU was on stock. Anyway, if SB is usually 10c cooler (from what I've heard) than Haswell when running IBT and P95, then my temps are more or less normal?

Edit: It seems the CPU used in the graph was running at 4.3Ghz.

 
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4Ryan6

4Ryan6

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Just out of curiosity did you mount the EVO cooler with the heat pipes in alignment with the core direction under the heat spreader of the 2700K, or did you mount perpendicular to the core alignment, because the best even core temps are with the pipes aligned.

That said all this stress testing you're running is really not good for your CPU are you trying to discover the CPUs breaking or cripple point?

Keep it up and you will!

Many would argue that running stress tests will not damage your CPU but all things have a TBF (Time Before Failure) point, and you are accelerating reaching yours!, with excessive running of stress testing programs, and you are not even stable at that.

You can continue until you damage the CPU, and run for weeks if it can do it, but just because you pass any stress test does not mean your system is stable, no one runs temperature testing using stress testing programs constantly unless your CPU is sacrificial, you keep pushing it to the edge sooner or later you'll find the breaking or cripple point of your 2700K.

Have you never read the fine print warnings and disclaimers regarding stress test programs?

Maybe failures don't happen everyday but they still want to protect the writers of the stress test programs with a disclaimer, that way they don't get sued when you use a run at your own risk program.

These temperature readings you're concerned about may be your first warning to back off, have you considered that?

Your ambient is basically your room temperature most use a thermometer to know what that is, but more accurate ambient is taken with a temperature probe inside the case located outside the CPU socket, that reading is actual ambient.

I strongly suggest you just continue on to a stable overclocked system and enjoy the computer before you end up regretting what you are doing, the link below will tell you how to do that.

http://www.tomshardware.com/forum/id-2345618/reaching-cpu-overclocking-stability.html

Note the 2700Ks temperature range.

http://ark.intel.com/products/61275/Intel-Core-i7-2700K-Processor-8M-Cache-up-to-3_90-GHz

The most simple reason for the IBT seemingly lower temperature is you've pushed your CPU with IBT into it's built in internal throttling protective state, and it is not longer running at it's max performance level.

Meaning the CPU lowered the temperatures to protect itself against you.

The temperature test link you provided does not disclose whether any of the CPUs tested reach their internal protective state, because if you cannot keep it cool enough to run the tests, the tests are invalid and completely useless!

If running overclock stress testing for temperature results is your goal, I suggest you get much better cooling than a CMH 212 EVO.

One last point and I'll leave you be, I had my 2700K overclocked to 5.3ghz custom water cooled, it is listed in the Intel Overclocking Club and it is still operational.

 
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Sturmgewehr_44

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I haven't really ran these tests for that long. I would say overall, I haven't run them for more than a combined hour, over a course of two weeks or so.

I would never leave it running over night.

That being said, I doubt the CPU is throttling. 70c is below the Tcase, and well below the TJmax. The Thermal Limit for the 2700k is 72.6c. The TJmax is I believe 98c. Not once have I ever succeeded any of these, and if at any point I did, it would have been for a brief moment when I was Overclocked on Turbo.

I have read many times that the Hyper 212 Evo is a great cooler for the money. Is that not enough for a decent Overclock?

However, I might upgrade to a H100i and maybe (I hope it won't be a sidestep) get a 3770k.

May I ask, what is the "Fine Print" for Prime95? I am aware of the disclaimer(s) for IntelBurnTest.

Why did you write this as if I am the bad guy? I just followed what other people told me, and did some research myself. You act as if my CPU is an entity that I am purposely hurting, and it can feel the pain. I doubt that is the case...

 
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4Ryan6

4Ryan6

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I didn't mean for it to come across as you're some kind of bad guy, I am just attempting to make you cautious running stress tests as it can affect the longevity of the CPU.

That being said, I doubt the CPU is throttling. 70c is below the Tcase, and well below the TJmax. The Thermal Limit for the 2700k is 72.6c. The TJmax is I believe 98c. Not once have I ever succeeded any of these, and if at any point I did, it would have been for a brief moment when I was Overclocked on Turbo.
Click to expand...

If you reached 70c on a 72.6c Thermal Limit CPU, then it already had begun internal throttling, it does not specifically throttle at 72.6c. it throttles to keep you below 72.6c, so it's internal throttling was already happening.

If you are curious you can find details on your CPUs thermal design here.

http://www.intel.com/content/www/us/en/processors/core/2nd-gen-core-lga1155-socket-guide.html

Adaptive Thermal Monitor
The Adaptive Thermal Monitor feature provides an enhanced method for controlling the processor temperature when the processor silicon exceeds the Thermal Control Circuit (TCC) activation temperature. Adaptive Thermal Monitor uses TCC activation to reduce processor power using a combination of methods.

The first method (Frequency/VID control, similar to Thermal Monitor 2 (TM2) in previous generation processors) involves the processor reducing its operating frequency (using the core ratio multiplier) and input voltage (using the VID signals). This combination of lower frequency and VID results in a reduction of the processor power consumption.

The second method (clock modulation, known as Thermal Monitor 1 or TM1 in previous generation processors)
reduces power consumption by modulating (starting and stopping) the internal processor core clocks. The processor intelligently selects the appropriate TCC method to use on a dynamic basis. BIOS is not requ
ired to select a specific method (as with previous-generation processors supporting TM1 or TM2). The temperature at which Adaptive Thermal Monitor activates the Thermal Control Circuit is factory calibrated and is not user configurable. Snooping and interrupt processing are performed in the normal manner while the TCC is active.

When the TCC activation temperature is reached, the processor will initiate TM2 in attempt to reduce its temperature. If TM2 is unable to reduce the processor temperature, then TM1 will be also be activated. TM1 and TM2 will work together (clocks will be modulated at the lowest frequency ratio) to reduce power dissipation and temperature.

With a properly designed and characterized thermal solution, it is anticipated that the TCC would only be activated for very short periods of time when running the most power intensive applications. The processor performance impact due to these brief periods of TCC activation is expected to be so minor that it would be immeasurable.

An under-designed thermal solution that is not able to prevent excessive activation of the TCC in the anticipated ambient environment may cause a noticeable performance loss, and in some cases may result in a TCASE that exceeds the specified maximum temperature and may affect the long-term reliability of the processor. In addition, a thermal solution that is significantly under-designed may not be capable of cooling the processor even when the TCC is active continuously. Refer to the appropriate Thermal Mechanical Design Guidelines for information on designing a compliant thermal solution.

The Thermal Monitor does not require any additional hardware, software drivers, or interrupt handling routines. The following sections provide more details on the different TCC mechanisms used by the processor.
Click to expand...

The CPU is designed to run in an ambient air environment and all it's built in features is so it can survive past the 3 year warranty covering it, however overclocking pushes it outside it's specification zone into temperatures it's protective features may be activated before they need to be at the speed the CPU is approaching it's heat protection.

The overclock combined with added voltage to stabilize the overclock produces additional heat that accelerates the activation of the CPUs thermal protection.

Sturmgewehr_44, Sometimes I come across as critical when actually my intentions are to help you get the most from your overclock as my goal is actually about CPU longevity, many would accuse me of the opposite with a 3770K overclocked to 5ghz, but it is 24/7 stable.

My cooling allows the overclock I am running, the 2700K can yield some very impressive overclocks 24/7 stable but you need better cooling than a CMH212EVO to hold down the top end temperatures or the CPU will protect itself.

It doesn't come across as Bluescreens or Crashes as the CPU still runs, however the more it needs to internally throttle the more obvious the performance drop is seen, with Intel Burn Test the performance drop can be seen in the Speed (GFlops) dropping.

Keep in mind the information above quoted from Intel is covering stock clocked Intel CPUs not overclocked, and when we overclock the CPU we change parameters, but the protective features are factory set that we users cannot control, so if you cannot control it, you simply operate under it.

Then the protective features do not activate at all and you have full CPU performance at the higher overclock.

There's been many threads here at Toms Hardware of those wondering why their benchmark performance score is worse with their overclock than the stock performance score was, and that's simply because the CPU is allowed to get too hot.

I have read many times that the Hyper 212 Evo is a great cooler for the money. Is that not enough for a decent Overclock?
Click to expand...

It is a great cooler for the money, but it's not the best cooler for overclocking for higher clock gains, so you either settle for a lower overclock that the CMH212EVO can handle, or get yourself a higher end cooling solution.





 
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