high cpu temperature during 100% load causing in game stutter ? Help required

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drumatticjim

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Mar 15, 2015
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Hi guys, I am experiencing in game stutter during all games on my new build. Have done some testing and discovered the following (all software, os, bios and drivers are updated. Using monitoring tools memtest86 (4 passes no errors), prime95, cpu-z, realtemp, msi afterburner, furmark, LatencyMon). The i7 4790k is set to stock clock of 4ghz and the ram is set to xmp profile of 1866mhz.....

FURMARK @ 2560x1440 (2x MSAA)
note: It was mostly butter smooth with the odd micro stutter for a minute or so during the ten min test.
FPS: 39 (min 31, max 41)
GPU1: 69 c (min 47 c - max 70 c)
core: 1379 MHz / 70 c / 99%
mem: 3505 MHz / 10%
GPU Power: 74.8% TDP,fan: 51%

-------------------------------------------
CoreTemp standalone BEFORE using Prime95

frequency 4400.00 MHz
processor #0
Core #0 = 24 c (Min 22 max 56) load 0%
Core #1 = 22 c (Min 19 max 59) load 0%
Core #2 = 20 c (Min 19 max 57) load 0%
Core #3 = 25 c (Min 23 max 54) load 0%

------------------------------------------
CoreTemp with Prime95

frequency 4400.00 MHz
processor #0
power: 170 watts
Core #0 = 95 c (min 22 max 98) load 100%
Core #1 = 99 c (min 19 max 100) load 100%
Core #2 = 98 c (min 19 max 100) load 100%
Core #3 = 90 c (min 23 max 96) load 100%

-----------------------------------------

The GPU temp from the test seems ok? They also seem ok when monitoring via msi afterburner. However, the CPU result with prime95 and coretemp seem really high? Could this be the cause of the problem? What are the possible solutions? Do I need to reapply thermal paste between the cpu and h100i cooler? Also when using RealTemp under no load the thermal status for the cores reads: LOG LOG LOG OK
however when running alongside prime95 it would often read: LOG HOT HOT OK.

Many thanks in advance for the replies.

system:
i7 4790k
16gb 1866mhz cas 9 ram
120gb samsung evo 850 ssd
seagate 2tb 7200rpm hdd
msi gaming 5 z97 mobo
gigabyte gtx 980 g1 gaming windforce edition
corsair h100i
evga g2 750w psu
corsair k70 rgb keyboard
corsair h2100 headphones
trust gxt 152
asus rog swift pg278q
 
Solution
CompuTronix
Guys,

Do NOT run any versions of Prime95 later than 26.6.

The problem with P95 is specific to versions 27.7, 27.9 and 28.5.

drumatticjim,

Your 2nd post above says that you were reading the Intel Temperature Guide ... if you had just read a little further ...

From Section 12 - Thermal Testing @ 100% Workload in the Intel Temperature Guide - http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html


"Core i 2nd, 3rd and 4th Generation CPU's have AVX (Advanced Vector Extension) instruction sets. Recent versions of Prime95, such as 28.5, run AVX code on the Floating Point Unit (FPU) math coprocessor, which produces extremely high temperatures. The FPU test in the...
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Reading this sticky....
http://www.tomshardware.co.uk/forum/id-1800828/intel-te...
suggets my temps are far too high? Should I try reapplying new thermal paste (have purchased arctic cooling mx-4) or should I try something else first?
Thanks guys
 
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Hi, yes it happened to be prime95 version 28.5, I shall try an earlier version and post results, many thanks
 
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Have run prime95 version 27.7 and the temp is still reaching 95 to 100 c max with the thermal status in realtemp still flicking between LOG and HOT.

Hope this info helps, thanks
 
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Guys,

Do NOT run any versions of Prime95 later than 26.6.

The problem with P95 is specific to versions 27.7, 27.9 and 28.5.

drumatticjim,

Your 2nd post above says that you were reading the Intel Temperature Guide ... if you had just read a little further ...

From Section 12 - Thermal Testing @ 100% Workload in the Intel Temperature Guide - http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html


"Core i 2nd, 3rd and 4th Generation CPU's have AVX (Advanced Vector Extension) instruction sets. Recent versions of Prime95, such as 28.5, run AVX code on the Floating Point Unit (FPU) math coprocessor, which produces extremely high temperatures. The FPU test in the stability testing utility AIDA64 shows similar results.

Prime95 v26.6 produces temperatures on 3rd and 4th Generation processors more consistent with 2nd Generation, which also have AVX instructions, but do not suffer from thermal extremes due to having a soldered Integrated Heat Spreader and a 35% larger Die."


Please download Prime95 version 26.6 - http://windows-downloads-center.blogspot.com/2011/04/prime95-266.html

Run only Small FFT’s for 10 minutes.

Your Core temperatures will test 20C lower with version 26.6.

CT :sol:
 
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Solution


ahhh i didn't go back enough versions I see! I will try again and post results, many thanks for the great advice!
 
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awesome, so, version 26.6 of prime 95 has really helped the monitoring process, the temps are indeed around 20 c lower than the newer versions. The minimum recorded temps are sitting at 73c whilst the max is pushing 85c and overall it sits around the 80c mark, The article states this as being too hot. Especially seeing as I'm using a h100i cooler. Is it the possible cause of a slight stuttering in games? I've got sp120 fans running in an nzxt phantom 530 case with good airflow so I'm guessing re-applying the thermal compound might be the way to go? Again cheers for the help and info, that article is so helpful!
 
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Congratulations! it's a great and well written article, wish I had read it sooner!

The ambient room temperature is 20 - 22c, I usually keep the window in my room open (and I live in the north east of England) so even with the pc running for a while it never got above that while testing.

I was looking down the thermal route for the cause of the slight stutter problem (taking a guess at potential thermal throttling causing the issue, however, it was just a guess lol) purely because I seem to have exhausted many of the alternative theories on here in regard to software driver install etc lol!

Many thanks, Jim

 
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Been reading some interesting forum posts regarding quite a few people suffereing stuttering and choppiness in games when the 900 series gtx cards drop their gpu usage below the high 90% mark with sudden spikes. I ran the vanishing of ethan carter in windowed mode so I could view the gpu usage in msi afterburner and this seems to be happening to me. The game does indeed stutter at the exact same time the gpu usage spikes below the high 90% gpu usage mark. Can't seem to see any fixes yet other than people screaming for a driver fix on the nvidia forums.

On another note I would still love to know if you think my cpu temps are too high and if you believe I should take any action to resolve them.

Kind regards
 
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Hi guys, managed to borrow my mates asus gtx 670 (which works fine on his computer) and installed it after using display driver uninstaller and doing a clean install using the drivers from nvidias website. The exact same thing is happening with this card on my setup. Choppiness occurs when there is spikes in gpu usage. So I think I can rule out the gtx980 issue mentioned before in this thread. Any ideas anyone? Could it be a setting on the bios needs changing? Is it possibly related to voltage? Thanks
 
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If you have a spare SSD or HDD laying about that you can afford to wipe, you could do a Windows, drivers and necessary S/W install (no need to activate) just for test purposes to rule out your software.

Is your PSU a single or muliple 12V rail(s)? You might try a different PCIE power connectors.

You might also try a different PCIE slot.

CT :sol:
 
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Unfortunately I have no spare hdd or ssd's lying around 🙁 I have however tried windows and s/w installs on both drives with the same end result.

The PSU is a EVGA SuperNOVA 750 G2 link here http://www.evga.com/Products/Product.aspx?pn=220-G2-0750-XR as I'm not entirely sure how to read the rails section in the details to answer your question, my apologies!

Cheers I will try a different PCIE slot next, I was under the impression the top slot was the best slot to install a single graphics card into? Or is it ok because the board supports 3 PCI-Express 3.0 x16 slots?

Thanks
 
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Your PSU is a single +12v rail, which should measure no less than 11.90 under very heavy CPU / GPU combined loads. Use the Power Supply test in OCCT to check out your PSU.

Your motherboard supports PCIE 3.0 x16 in the 1st and 2nd slots. The 3rd slot supports PCIE 2.0 x16.

Try your GPU in the 2nd (middle) PCIE slot. Let's see what happens.
 
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Hi, just tried the GPU in the second slot, and are getting exactly the same issues. GPU load still spikes at the same time the games stutter.

I downloaded and ran a power supply test in OCCT using its default settings for around 5 minutes. The min and max for the +12V are min: 11.18V and max: 11.26V. This doesn't seem to match your recommendation that the psu should not drop below 11.9 during the test? :??:

(For reference the settings in OCCT were (test type: Infinite, Duration: 1h, Idle Periods 1 min at the beginning, 5 min at the end, DirectX version 11, graphic card: nvidia geforce gtx980, resolution: 2560x1440, 64 bits linpack))
 
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Wow! 11.18 under load indicates very poor voltage regulation at 7%.

It's difficult at this juncture to pin your GPU stutter on the PSU without testing your rig on another supply.

Regardless, 7% below nominal on the 12V rail is just plain sloppy. :pfff:

What is your +12 under no load at dead idle?
 
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Interesting, I'm also a little surprised as this psu seemed to have such good reviews and seems to be used quite a lot by pc builders, anyway I digress,

I've rebooted the PC, closed down everything I could think of and used OCCT under the psu tab (without running the test itself), the +12V sits at 11.26V for the vast majority of the time and occasionally bounces down to 11.18V and back again
 
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Unless a hardware measurement with a digital multimeter disagrees, you've got a bad 12 volt rail in your power supply, which means RMA.

If you can borrow a meter, check between the yellow and adjacent black wires on the 24 pin motherboard connector.

If it reads a similar value to the software reading, then you have your answer.

Keep in mind that the separate 8 pin motherboard connector supplies +12v power to the CPU socket.

In addition to being far too low, if the +12v power is fluctuating under load or has excessive "ripple" on the DC waveform not visible in OCCT, this can cause many types of operational anomalies, including but not limited to frame stutter.

Not that it matters much now, but what are the voltages on the +5v and +3.3v rails?
 
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Unfortunately I don't know anyone with a multimeter, I could always pick one up from a local diy store? Or would this one on amazon suffice?....

http://www.amazon.co.uk/Draper-60792-Digital-Multimeter-Backlight/dp/B0001K9XKW/ref=sr_1_6?ie=UTF8&qid=1427158508&sr=8-6&keywords=digital+multimeter
Should I test the 8 pin as well as the 24pin connector?

The cables on the evga power supply are modular and totally black, meaning no distinction between yellow/black wires, however, I'm assuming a quick search online to other 24 pin connectors with colours would be able me to deduce the correct connectors on the cable to test?

Here are all the sensor readings from OCCT under no psu load....
AVCC 3.31V
3VCC 3.31V
CPU VCORE 1.19V
VCCIN 1.9V
DRAM 1.5V
+12V 11.26V
+5V 5.04V
VID 1.18V
IA 1.21V
GT 1.16V
LLC/Ring Offset 0V
System Agent Offset 0V
VINO 0,86V

edit: all readings remain stable except two...firstly the 12v fluctuates between 11.26 and 11.18 and secondly the cpu vcore fluctuates betweem 1.19v and 1.2v

Again, many thanks for your help :)
 
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If you feel that a meter is a tool you should have on hand and can make use of in the future, then by all means get one. As an engineer I have several.

Measuring your +12v rail is more of formality to confirm what the software is reporting prior to RMA.

You might also take a look in BIOS to see what it reports.

Remember that your PSU has a single +12v rail, so it really doesn't matter which connector you measure, except that the large 24 pin connector is typically the easiest to reach with meter probes.

The wire colors, voltages and pin locations are standardized, so they're the same on all PC power supplies.

With a PSU completely disconnected from the computer, you can force it to power up by inserting a short wire or section of paper clip into the pins of the green wire and its adjacent black wire on the 24 pin connector.
 
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Excellent, I shall obtain a meter and report back to you with the findings! And if in requirement of an RMA I shall pick the relevant answer as the solution and hope it helps others to solve their problems :) I can't thank you enough for the help!

Just out of interest, I'm assuming you've had experiences with RMA's, what kind of turnaround times for these have you usually encountered? 2 weeks? a month? longer?
 
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Bad news (I think?!), I have just checked the readings from the bios in regards to the 12v reading, the bios is reading 12.88v. That seems quite a way off the 11.26v reported by the software read out?
 
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12.88 is far too high. BIOS may also be wrong. :pfff:

The expected tolerance for a decent +12v rail should be +/- 0.10 or 11.9 to 12.1, or more preferably +/- 0.05 or 11.95 to 12.05.

My +12v rail is 11.98 under load, and 12.01 at idle, which is normal and expected, and is well within +/- 0.05 tolerance.

The only way to know for certain is to check it with a meter ASAP. :??:

Most meters have a selection to measure inside a 20VDC range. Make sure that the meter you purchase has enough decimal places, such as 20.00, or better yet, 20.000. You need to read the specs to be sure.

In the world of multimeters and electronics test equipment, just as with most other gadgets, you get pretty much what you pay for.
 
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