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post #18741 of 22525
Hi.
I just bought and built my PC.

My plan was to overclock my CPU (i7 4790k), but i came acroos an issue !
I have an Alpenföhn Matterhorn Rev.B as cooler.

First i wanted to stress test my CPU at stock Frequency.

Idle I'm at 25°C : it is OK.
Regular Stress test (Prime95 version 26.6 and OCCT Linkpack with logical core) work under 85°C : It is a bit disappointing since my Air cooling should work better no ?

Stress testing AVX (Prime95 version 28.7 and OCCT Linkpack with logical core and AVX) : Fast huge temperature (rising at 100°C in 7 min with Prime95 and OCCT stop after 30s because going over 85°C). Is something wrong or not ?
Because I Read some stuff about AVX automatically up Vcore and thus climbing in temperature fast.

To sum up : Should I expect lower Temperature and though accuse my work on assembly my air cooler (may be too much TIM?) ? Or is that well known that AVX dont match up well with i7 4790K ?

Thanks for any answer and sorry for my poor english. wink.gif
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post #18742 of 22525
Quote:
Originally Posted by elTRex View Post

Hi.
I just bought and built my PC.

My plan was to overclock my CPU (i7 4790k), but i came acroos an issue !
I have an Alpenföhn Matterhorn Rev.B as cooler.

First i wanted to stress test my CPU at stock Frequency.

Idle I'm at 25°C : it is OK.
Regular Stress test (Prime95 version 26.6 and OCCT Linkpack with logical core) work under 85°C : It is a bit disappointing since my Air cooling should work better no ?

Stress testing AVX (Prime95 version 28.7 and OCCT Linkpack with logical core and AVX) : Fast huge temperature (rising at 100°C in 7 min with Prime95 and OCCT stop after 30s because going over 85°C). Is something wrong or not ?
Because I Read some stuff about AVX automatically up Vcore and thus climbing in temperature fast.

To sum up : Should I expect lower Temperature and though accuse my work on assembly my air cooler (may be too much TIM?) ? Or is that well known that AVX dont match up well with i7 4790K ?

Thanks for any answer and sorry for my poor english. wink.gif

I don't know how many times and ways this needs to be stated, but DONT USE PRIME95 FOR HASWELL. Sorry to yell there. So often on this forum people with no concept of how to overclock or how stock BIOS' OVERVOLT this cpu think that they will get some sort of baseline and potentially damage their cpu. There is NO reason to stress with a stock BIOS. Almost every overclocking forum in this site recommends starting at 1.2V and working up from there using x264 or RealBench. Please do some research before you damage to your chip.

Again, sorry for using you as a platform, but this is a repeating problem.
post #18743 of 22525
Since
Quote:
Originally Posted by kl6mk6 View Post

I don't know how many times and ways this needs to be stated, but DONT USE PRIME95 FOR HASWELL. Sorry to yell there. So often on this forum people with no concept of how to overclock or how stock BIOS' OVERVOLT this cpu think that they will get some sort of baseline and potentially damage their cpu. There is NO reason to stress with a stock BIOS. Almost every overclocking forum in this site recommends starting at 1.2V and working up from there using x264 or RealBench. Please do some research before you damage to your chip.

Again, sorry for using you as a platform, but this is a repeating problem.

Thank you for your answer.
Since you fully argued your point, then no offence, I totally understand.

Though you said "NO reason to stress with a stock BIOS", but If i wanna mesure how my cooling system perform i thought i could test it that way.
Or maybe you mean I should first disable Energy saving in BIOS ?

Maybe it would be better to test temperature in real application like game (I think ARMA 3 will be a good one) ?

And finally I'm still seek intel and understanding about AVX since these instruction rocketed my temperature fast AND i know they are used in some game too.
Edited by elTRex - 11/9/15 at 5:10pm
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post #18744 of 22525
Quote:
Originally Posted by elTRex View Post

Since
Thank you for your answer.
Since you fully argued your point, then no offence, I totally understand.

Though you said "NO reason to stress with a stock BIOS", but If i wanna mesure how my cooling system perform i thought i could test it that way.
Or maybe you mean I should first disable Energy saving in BIOS ?

Maybe it would be better to test temperature in real application like game (I think ARMA 3 will be a good one) ?

And finally I'm still seek intel and understanding about AVX since these instruction rocketed my temperature fast AND i know they are used in some game too.

Allow me to clarify.

You should not use the hottest, most unrealistic test to stress your brand new cpu. Start with a realistic load like Cinebench and work your way up. There is a good comparison of stressing tools on the Skylake Overclocking Guide.

Your motherboards stock BIOS will put excessive voltage into your chip to guarantee stability. This is not a bad thing for gaming, but using the most stressful and hottest AVX set, like the new Prime95, is not what the BIOS engineers assumed people would do with their new chips. That's why there are posts asking "why is my stock chip hitting 100C using Prime95".
Edited by kl6mk6 - 11/9/15 at 7:23pm
post #18745 of 22525
Quote:
Originally Posted by elTRex View Post

Hi.
I just bought and built my PC.

My plan was to overclock my CPU (i7 4790k), but i came acroos an issue !
I have an Alpenföhn Matterhorn Rev.B as cooler.

First i wanted to stress test my CPU at stock Frequency.

Idle I'm at 25°C : it is OK.
Regular Stress test (Prime95 version 26.6 and OCCT Linkpack with logical core) work under 85°C : It is a bit disappointing since my Air cooling should work better no ?

Stress testing AVX (Prime95 version 28.7 and OCCT Linkpack with logical core and AVX) : Fast huge temperature (rising at 100°C in 7 min with Prime95 and OCCT stop after 30s because going over 85°C). Is something wrong or not ?
Because I Read some stuff about AVX automatically up Vcore and thus climbing in temperature fast.

To sum up : Should I expect lower Temperature and though accuse my work on assembly my air cooler (may be too much TIM?) ? Or is that well known that AVX dont match up well with i7 4790K ?

Thanks for any answer and sorry for my poor english. wink.gif

Hello,

If you'd like to have a second opinion, here is my system - fully shown in my sig_rig - running Prime95, Small FFTs for around 10 minutes. I have loaded Optimized Defaults before running the test.

Warning: Spoiler! (Click to show)
Ambient temperature: 21C
CPU cooler: Corsair H110 - this AIO is approx. three weeks old.
TIM: the pre-applied H110's TIM
CPU cooler's fans: the 2 Noctua Industrial fans shown in my sig_rig
Note: my AIO's fans were not running at their full speed, which is around 1870 RPM, due to the custom curve I've set for them in the BIOS


I want to underline that I never use Prime95 to test my O/C attempts. I use it on special occasions only. My preferable stress test is the x264 V2.06

Good luck with your O/C! smile.gifthumb.gif
Edited by LostParticle - 11/10/15 at 12:11am
    
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post #18746 of 22525
Quote:
Originally Posted by kl6mk6 View Post

I don't know how many times and ways this needs to be stated, but DONT USE PRIME95 FOR HASWELL. Sorry to yell there. So often on this forum people with no concept of how to overclock or how stock BIOS' OVERVOLT this cpu think that they will get some sort of baseline and potentially damage their cpu. There is NO reason to stress with a stock BIOS. Almost every overclocking forum in this site recommends starting at 1.2V and working up from there using x264 or RealBench. Please do some research before you damage to your chip.

Again, sorry for using you as a platform, but this is a repeating problem.

So you are saying that you don't use Prime95 at all for checking stability on Haswell / Devil Canyon? I run 20min of Prime95 only to stress and make sure there's no lock ups or Blue screens. I run OCCT for 10min, and then use Real Bench and Cinebench, and then some cpu intensive games. But 99% of the time 20min and 10min of Prime / OCCT always means stable. NO WAY will I do 24 hours and never have. That's just dumb IMO and way to much hurt on your cpu for no reason. But I do things a lot different that others and work my way up to my overclocks with testing the Clock first, then bringing in the Cache Freq, and then loading XMP profiles and do my testing everytime. You always should do things little by little so you know what's failing.

Unlike those that say i'm not stable at 1.350v at 4.8ghz, but have no idea and have not tested things alone. Needing to keep Input Voltage at minimum +0.5v (I keep it +0.520v above) above your cpu Vcore. 1.350v needs 1.850v (1.870v I use) and so on. That's a big part that many don't do. The higher you want to keep your Cache freq, sometimes that will need more Input voltage because it's taking from the total pot of voltage you are giving the system to use.

MY 2 cents thumb.gif
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post #18747 of 22525
Quote:
Originally Posted by Hambone07si View Post

So you are saying that you don't use Prime95 at all for checking stability on Haswell / Devil Canyon? I run 20min of Prime95 only to stress and make sure there's no lock ups or Blue screens. I run OCCT for 10min, and then use Real Bench and Cinebench, and then some cpu intensive games. But 99% of the time 20min and 10min of Prime / OCCT always means stable. NO WAY will I do 24 hours and never have. That's just dumb IMO and way to much hurt on your cpu for no reason. But I do things a lot different that others and work my way up to my overclocks with testing the Clock first, then bringing in the Cache Freq, and then loading XMP profiles and do my testing everytime. You always should do things little by little so you know what's failing.

Unlike those that say i'm not stable at 1.350v at 4.8ghz, but have no idea and have not tested things alone. Needing to keep Input Voltage at minimum +0.5v (I keep it +0.520v above) above your cpu Vcore. 1.350v needs 1.850v (1.870v I use) and so on. That's a big part that many don't do. The higher you want to keep your Cache freq, sometimes that will need more Input voltage because it's taking from the total pot of voltage you are giving the system to use.

MY 2 cents thumb.gif

I clarified that Prime95 should not be the first test for a beginner on a new system, and should be worked up to (see 3 posts up). I start with Cinebench, then run Realbench for 15 min, then if that passes I run 30 min of OCCT:linpack for 30 min. Then some intensive gaming. If you are going to be video encoding or rendering you will probably want to test for 8-12 hours.
post #18748 of 22525
Gotcha. I do believe that it's a good thing to run OCCT or Prime95 for at least 30min, one or the other. It will give the hottest load (prime95) and if you can maintain good temps with that, then you'll be good in anything you do.

Prime95 hits my system 4790K @ 5ghz 1.350v up to 75c on hottest core, but usually in mid 60's. Games barely touch 60c on the hottest core and usually in the low 50's on something cpu intensive.

My rule of thumb for overclocking Haswell is to take everything out of the equation.
1. test max cpu core clock
2. bring up the cache freq with max core clock where you settled
3. enable xmp ram profile and then add that to the max cpu clock / cache freq.

Then you will find where your cpu can overclock to and you'll know if it's the cache, ram, or cpu that's stopping you at a certain speed.

My final is 5ghz @ 1.350v @ 45x Cache Freq 1.200v @ XMP 2400. But I use 50 x 100.1 to add just a tad more Blck to the mix. very minimal
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post #18749 of 22525
To chime in, the only reason to use Version 27.x+ is to test the absolute heat max IF AND ONLY IF you will be using AVX (version 27.x) or AVX2 (version 28.x) in any sense that actually stresses it to this degree! Same is true of OCCT! If you want average temps and stability testing, using Prime95 26.x should be fine. It does not run as hot as the others.

For stability testing, I recommend a plethora of stress tests that do not run hot and benchmarks to stress in different ways. This includes opening more than 100 tabs in a browser and searching/using it in this state. I've had Chrome bring down a Prime95 stable machine. These tests only show stability within that program.
post #18750 of 22525
Thanks you all for your answers.
I'm still a bit confuse about my installation.
In a few word, Without AVX I stabilize at 80°C (Prime95 26.6, OCCT LinPack, x264 16T), and reaching withing 5 minute 100°C with AVX (I didn't test again since i understand it could damage my CPU, it is just what i experimented yesterday).
What I don't know is if 80°C should be expected for those test using my CPU cooler (I think it is a good air cooler based on test i read before I bought it) or is something wrong cause i should expect lower temperature ?

I just tested an ARMA 3 session, my CPU usage is around 20% And I'm around 40-50 FPS (because I'm using a HD6770 graphic card i guess), and the temperature stabilize at 50°C.

I don't know if theses figures make sense for you or not ?
Edited by elTRex - 11/10/15 at 9:52am
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