High CPU Temps under load?

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Bluedasher

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Dec 25, 2014
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I'm not quite sure what the problem is here... My system idles at 35C, and when I game it hovers around 60-65C... These temperatures are acceptable. But when I go to render something, I hear my case fans speed up, and my core temperatures climb to a jaw dropping 95+ degrees Celsius! And they stay there for the duration of the render. I really am not sure what the problem is. Any help or thoughts from more experienced builders would be appreciated!

CPU: i7 4790k
Mobo: AsRock Fatal1ty Z97 Killer
Cooler: Corsair H100i
 
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Not overclocked.

Just decided to run a torture test with Aida64 on JUST the CPU and after 5 minutes the average temperature is 73C. I have done many virus scans on my PC and have no viruses I'm sure, however, I do use cracked software for video editing. Is there any way this could be a cause or no?
 
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Corsair link says the pump is set to maximum speed of 2270rpm... The "mobo cpu aux fan" is 2000 rpm and the "mobo system fan" is at 1000rpm. Like I said, the idle temperatures and even gaming and recording temperatures are fine. It's only when I render with these programs that things get really hot really fast.

 
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AIDA 64 testing can put a very unrealistic load on your CPU..... the question is is it running with all instruction sets enabled. Your problem is you are getting high temps with rendering, your task therefore is to:

1. Test with a standard benchmark utility such as RoG real Bench. It's a suite of 4 real programs one of which is a rendering app. The Open CL test uses AVX instruction sets and if you have adaptive over clocking (most do), your voltages will spike up about 0.10 to 0.13 which will seriously bang up the heat level.

2. Make sure you know what your measuring and what you are comparing it to. Both CPU Temp and CPU Core temps are important and are different. The CPU Temp is generally a compendium of measurements from MoBo sensors for which the MoBo manufacturer has created an algorithym to report a composite temperature and control cooling functions built into the board. It is not the core temperature which will be much higher. A 30 C temperature swing between the CPU Temp and Core temps is not unusual.

What we are concerned about or the long term viability of your CPU is a) core temps and b) core voltages. So here's what I recommend:

1. Stop using AIDA, Prime 95 or anything else like that. Download RoG Real Bench and HWiNFO64

http://rog.asus.com/forum/showthread.php?43233-Realbench-v2-Discussion-Thread-Download-Links
http://www.hwinfo.com/download.php

2. When you open Real Bench, move both windows to left side of screen. Open HWiNFO64, run "sensors only", you may get a pop up asking whether to disable reading on an board EC chip, click "Disable this sensor". Move the HWiNFO64 window to upper right hand corner of screen. Stretch bottom of window to full screen height. Optionally, make the following changes:

-Right Click on "System" right at the top, select hide.
-In the next section, hide the last 4 lines starting "Core CPU Thermal Throttling" (if you watch temps, this is useless)
-Skip over the next section and Hide the section after that (section includes CPU Package thru DRAM Power)
-Now the whole reasons I do that was so I could see everything I wanna see at same time. You should be able to all core temps and see Vcore 0, 1 and 2 at -the bottom of the window. If not hide a few more lines. Save and Quit will save your edits. But again this is optional, if ya donm't do it, all it means is you will use the scroll butto.

4. In Real Bench, select Benchmark Tab Check only the last box. Open HWiNFO64, run "sensors only" as described above. Start Real Bench and don't touch mouse till finished.....again one of the reasons I hide things as using the mouse on scroll bars cancels the test. Observe voltages and temps. If you can get thru these 2 minutes, go to next step.

5. Then try checking all 4 boxes and run again NOTE: During the 3rd test Open CL will send AVX instructions to CPU; pay close attention to Vcores as they will spike as described above. If passes.....

6. Switch to the Stress Test Tab and select the amount of RAM you have in your system and 2 hours.....

7. Look at HWiNFO64 and see what max core temp was over the two hour period. It actually won't be all that different than the short benchmark test but will tell you a lot about system stability at those voltages / temps.
 
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I have done up until step 4. in the above post. I was NOT comfortable continuing onto step 5. without sharing my results here:

oks95v.jpg


I can admit that I do not know much about temperatures and voltage, but 1.2+ volts on a single core and over 90C on 3/4 cores seems a bit too much. What might I do next?

 
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I don't know what "ACX Instruction set" even means TBH. All I know is I can open up a graphic and cpu intensive game like BF4 and play that WHILE recording without CPU temps exceeding 70C, yet I can't render out a video without worrying about melting my processor?

I haven't overclocked my CPU at all! It has a base clock of 4.0ghz with a 4.4ghz turbo boost.

 
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Those temps were from using RoG Real Bench?

It seems as bad as Prime 95. A lot of people are now using just version 26.6 of Prime 95. Its not as hard on the CPU.

I'm trying to get people to try Intel Processor Diagnostics tool. Temps don't seem so high with it.

Maybe try again with those instead and post the temps you're getting with each.
 
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Yes, that was with RoG Real Bench. Thing is, I'm getting the exact same temperatures from real-world rendering in Sony Vegas, Adobe After Effects, and Camtasia. I really am at a loss of what to do. Is it a problem with the CPU? Have I not configured something correctly in the BIOS? I honestly don't know guys.
 
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You can see if it's the AVX instruction set by running the first two programs in the benchmark .... and them comparing the results with the third. Since you are concerned mainly about rendering, the rendering test in Real Bench will be most fitting to your concerns.

I also note that you are hitting your 4.4 Ghz turbo Speed only on one core. As for AVX

http://en.wikipedia.org/wiki/Advanced_Vector_Extensions

You could test with benchmarks that don't use AVX but I don't see the point as you will be using applications that do. When I test with P95, my temps can be 10+C above what I get in Real Bench so I would "not go there".

If concerned about the BIOS< \I would set all settings to default and try again.
 
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If you're getting the same high (90C core) temps while rendering, I'm wondering if you haven't properly installed your CPU cooler eg left the plastic on or not used thermal paste on the water block.

Also, can your install and use " Full HD UEFI" per http://www.asrock.com/mb/intel/fatal1ty%20z97%20killer/ - which should've come on a disk with your motherboard.
 
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Yes, that was my 1st thought (Post 2) .... looking back, still wondering how fans were installed ..... blowing in (correct) or blowing out (incorrect).

I would:

1. Buy this .... nothing better.
http://www.newegg.com/Product/Product.aspx?Item=N82E16835150080

http://archive.benchmarkreviews.com/index.php?option=com_content&task=view&id=150&Itemid=62&limit=1&limitstart=12

Gelid GC-Extreme (0) Aluminum Oxide Low / Thin 37.65°C A+
Thermaltake Grease A2150 (4) Polysynthetic Silver Low / Thin 37.65°C A+Arctic Silver 5 Polysynthetic Thermal Compound (4) Polysynthetic Silver Low / Thin 37.55°C A+
Shin-Etsu MicroSi G751 (0) Aluminum Oxide Moderate 37.55°C A+
Click to expand...

ArticSilver is just as good thermally but 200 hour curing time and capacitance issues of AS5 and Thermaltake knoick them off my list.

2. Clean CPU and water block thoroughly with 90% + isoprophyl alcohol

3 Apply thermal paste per the link below:
http://archive.benchmarkreviews.com/index.php?option=com_content&task=view&id=170&Itemid=38

4. Reinstall and make sure you have pump flow

5. Make sure correct seating pressure is being applied. Does the WB have stops to prevent over tightening ?

6. Make sure fans are blowing into case.

7. Retest

If no improvement, your choices would be ....

a. Downclock the processor
b. Get a better cooler (Swiftech H240-x or H220-X)

Rendering is one of the biggest demands you can put on a CPU which is why it is included in RoG Real Bench

On my 4770k, I see temps of 72C in RoG Real Bench @ 4.6 Ghz










 
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I don't know a lot, but I'd be willing to guess that other CPU cores didn't hit the 4.4ghz turbo boost because of the temperatures. If the temperatures were much lower, I would guess it would perform correctly.

The CPU cooler was properly installed. All plastic was removed from the front and back of the CPU block. It came with preapplied thermal paste on the actual CPU block (Which I'm told is very high quality paste) and I made sure when I installed it that I did not lift up the block at any point thereby causing air pockets to form in the thermal compound. I also wiped down the CPU itself with 90% isopropel alcohol BEFORE installing the cooler. I have 1 fan blowing into the case and two blowing out, although I would be greatly surprised if the orientation of ONE fan or the lack of ONE fan (especially when the pump is installed correctly) would cause temperature gains of 30-35C above what is normal.

I'm also getting reasonable idle temperatures as well as acceptable temperatures while screen recording CPU intensive games that I play. This particular CPU is also widely known to be on the cooler side of high base clock CPUs; It doesn't even begin to come close to the reported temperatures of comparable AMD CPUs such as the 9590.

It seems to be ONLY rendering that causes other-wordily CPU temperatures. I haven't done anything in the BIOS other than enable XMP Profiles and turn on USB connections. Would the lack of a BIOS update or some setting there be the cause of high CPU temps ONLY while rendering? I run a YouTube channel so this is kind of causing a MASSIVE problem with my flow of videos right now.
 
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Yes, expect thermal throttling at 95C or so. The only BIOS issues would be voltage related.

One thing, as before to check is to compare the temps during each of the first 3 tests in the RoG Real Bench test suite

Here's what I see

Image Ed. 1.392
Encoding 1.408
Open CL 1.488/1.504
Multitask 1.408

My guess is that the Open CL test is the one getting the high temps. many rendering programs use OpenCL and when this happens the CPU gets a voltage boost which is the likely source of the high temps. If this is confirmed, you could switch from Adaptive voltage control to manual and then this boost will not occur. OTOH, neither will the CPU downclock to it's energy saving state when idle.

As for the installation, desired clamping pressure on a cpu block is about 60-70 pounds

http://www.innovationcooling.com/key_to_performance.html
 
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Accidentally clicked on your post as best answer. You have definitely contributed the most useful information here thus far, but as my problem is not resolved, it wouldn't make sense to put that as the best answer. Someone who finds this thread may think this will solve their problems. Not sure how to undo that selection xD

Anyway, my GPU does support OpenCL and I usually have that option checked when rendering in Sony Vegas and most of my editing programs. I didn't know this could cause CPU temps to be affected though. I will turn off adaptive voltage control in the BIOS and choose not to use OpenCL in Sony Vegas and see what my temperatures are.

 
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Simple enough..... as in the previous 2 postings, all ya gotta do is run the benchmark and compare the results.

Image Ed.
Encoding
Open CL
Multitask

What are the temps and voltages that that you see for each of the 4 tests ?

Open CL uses BOTH the CPU and GPU. If you do what was suggest in thise other posts i think you will find that peak temps and voltages occur during the open CL test as ACX instructions are used. Choosing NOT to use Open CL with the GPU I would think simply shifts more load from the GPU to the CPU.
 
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