CPU Or Load Throttling With HT Enabled? Help

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Solved CPU Or Load Throttling With HT Enabled? Help

Post by 4hams on Sat Apr 17, 2010 1:50 pm

Hey folks I have been trying to get the rig stable @ 4.2 with HT enabled and it appeared as if I had as it passed stress testing with Intel Burn test with no problems, or so I thought...

When stress testing @ 4.2 with HT disabled CPU-Z shows a 100% Load on all 4 cores during the test as this screenshot shows.

CPU Or Load Throttling With HT Enabled?  Help ScreenShot072

But when I enable HT and stress test CPU-Z will not show a 100% Load when testing. It appears that the CPU is being throttled?

CPU Or Load Throttling With HT Enabled?  Help ScreenShot069

When HT is enabled I have 2 threads per core and when it is disabled I only have one thread per core which is normal.

So my question is. When HT is enabled and I am testing with CPU-z to monitor is my Load actually 100% but showing less because I now have 2 threads per core? Or is my CPU being throttled with HT enabled?


Last edited by 4hams on Tue Apr 27, 2010 7:17 am; edited 1 time in total
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Solved Re: CPU Or Load Throttling With HT Enabled? Help

Post by McstylisT on Sat Apr 17, 2010 2:12 pm

Hey Joel.

I personally do not think you have anything to worry about. I pretty much have the same result as you when doing tests that way.

When HT is turned off then it seems the 4 cores are stressed to the very max and 100%.
Though when HT is enabled ( 2 threads on each core ) the workload is calculated quicker so it does not need 100% usage to complete the complex calculations. Though the temps go up seriously with the change of usage.

The main points are , it passes intel burn test and deems the system stable. Your voltages and everything are within a reasonable level ( i know they are smile )

Good eyes for spotting this as it is an interesting question. Those are my main theories why this happens. I would not worry 4hams.

If you still have concerns you could try prime95 as it will find any errors quite easily. Though i am not a fan and find IBT the best and most effective.

McT

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Solved Re: CPU Or Load Throttling With HT Enabled? Help

Post by 4hams on Sat Apr 17, 2010 2:21 pm

Thanks Craig I will try Prime later this evening.
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Solved Re: CPU Or Load Throttling With HT Enabled? Help

Post by McstylisT on Sat Apr 17, 2010 2:27 pm

Also you could try OCCT as well. That has a good little error finder on it and will halt the test if something is found.

Though someone respectful told me that even if a system is rock solid stable. It will not pass all the stress tests. One or some will fail. This is just the way some things work. There is no such things as the ideal environment to stress.

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Solved Re: CPU Or Load Throttling With HT Enabled? Help

Post by 4hams on Sat Apr 17, 2010 2:39 pm

I agree there is never and ideal software or environment for stressing. but OCCT sure brings up the temps! Shocked
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Solved Re: CPU Or Load Throttling With HT Enabled? Help

Post by McstylisT on Sat Apr 17, 2010 2:58 pm

Indeed it does. :D

Though on average Intel burn test causes the highest temps for most users.

Just do not allow any core to go over 90 as insurance. :D

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Solved Re: CPU Or Load Throttling With HT Enabled? Help

Post by 4hams on Sat Apr 17, 2010 3:06 pm

I think 81 is the highest I have ever seen one of my cores at and onle for a second or 2.
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Solved Re: CPU Or Load Throttling With HT Enabled? Help

Post by McstylisT on Sat Apr 17, 2010 3:16 pm

4hams wrote:I think 81 is the highest I have ever seen one of my cores at and onle for a second or 2.

That is pretty impressive , especially with HT. I would say mid 80's is still safe for a stressing purpose. Just goes to show how good that case and cooling system you have are doing Joel.

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Solved Re: CPU Or Load Throttling With HT Enabled? Help

Post by 4hams on Sat Apr 17, 2010 3:29 pm

Tha case is awesome. the filters on the fans are the bomb. Today after about 3 months of use I finally vacumed it out cause i could no longer see into the case due to dust. LOL

Now i can see the cool blue leds again. ROTFLMAO
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Solved Re: CPU Or Load Throttling With HT Enabled? Help

Post by 4hams on Sun Apr 18, 2010 6:59 am

Hey folks I have solved the issue of CPU-Z only showing about 50% load when stress testing with Intel Burn Test and Hyper Threading enabled.

When using Intel Burn Test with 4 core CPU's the setting in IBT for threads can be left on auto and it will stress all 4 cores to 100% load.

If your CPU happens to be a Hyper Threading CPU which is enabled in the Bios you must then adjust the thread setting in IBT to the appropriate thread # to create a 100% load testing atmosphere. Therefore a quad core with HT enabled actually has 4 cores but 8 threads so the setting in Intel Burn test has to be set to 8 threads in order for the program to load the CPU up to 100% load.

Let me tell ya once you do this the temps go up very fast and very high!!!

So be carefull to watch the temps and remember to adjust the amount of threads accordingly when testing with Intel Burn Speed.

Oh ya by the way my stress testing @ 4.2 GHz with HT enabled failed miserably!!! Shocked So I am going to start all over again with my overclocking and see about shooting for 4.1 GHz stable overclocking with Hyper Threading enabled. I'll keep you all posted.
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Solved Re: CPU Or Load Throttling With HT Enabled? Help

Post by McstylisT on Sun Apr 18, 2010 7:58 am

Thanks for the information Joel.

I am sure i read something about this. I am not sure its even possible to pass it with the 8 threads selected. I think auto was the correct setting. I will try to find the thread i read it from for ya.

Go back to 4ghz mate and see if it passes there with the 8 threads selected ?

McT

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Solved Re: CPU Or Load Throttling With HT Enabled? Help

Post by 4hams on Sun Apr 18, 2010 8:06 am

I will start from the beggining and work up to 4.0 with HT and see if I can get it too maybe 4.1 with HT...

Maybe get a chance to try tonight?
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Solved Re: CPU Or Load Throttling With HT Enabled? Help

Post by smduff on Sun Apr 18, 2010 10:55 am

If your going to leave the HT on there is no real point to get to 4100MHz Joel you will not benefit from the extra 100MHz you won't even notice it, I would say either go for 4200MHz or go for 4000MHz. The extra heat generated isn't worth the effort for the 100MHz but if you can get it to 200MHz where you will start to see the difference, then it is JMHO.
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Solved Re: CPU Or Load Throttling With HT Enabled? Help

Post by 4hams on Tue Apr 27, 2010 7:24 am

smduff wrote:If your going to leave the HT on there is no real point to get to 4100MHz Joel you will not benefit from the extra 100MHz you won't even notice it, I would say either go for 4200MHz or go for 4000MHz. The extra heat generated isn't worth the effort for the 100MHz but if you can get it to 200MHz where you will start to see the difference, then it is JMHO.
Thanks for the imput Steve!
I took your advice when I started from scratch. I reset the Bios to the system defaults and started over. With my case and the cooling I am using 4.2 GHz was going to be very difficult if possible at all. So I decided to go for a 4.0 GHz overclock with both Hyperthreading and Turbo enabled. Well I did it with no problem at all. I was actually surprised how easy it was to get a stable clock at that speed with both Turbo and HT enabled.

Have a look at this thread to see the full details of the Stress Testing and my exact system settings.

http://mcstylists-overclock.forumotion.com/cpu-overclocking-f6/post-your-cpu-overclock-t10.htm#2065
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Solved Re: CPU Or Load Throttling With HT Enabled? Help

Post by smduff on Tue Apr 27, 2010 9:18 am

Nice work Joel, it looks really good.
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Solved Re: CPU Or Load Throttling With HT Enabled? Help

Post by 4hams on Tue Apr 27, 2010 9:36 am

Thanks Steve even when stress testing the individual cores stayed very cool at 4.0 GHz.
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Solved Re: CPU Or Load Throttling With HT Enabled? Help

Post by smduff on Tue Apr 27, 2010 11:39 am

Now as soon as I get my new CPU I will have it clocked to 5GHz and show you Intel guys how it's done LMAO.
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Solved Re: CPU Or Load Throttling With HT Enabled? Help

Post by 4hams on Tue Apr 27, 2010 2:14 pm

All the power to ya my friend. With that coolit elite you just might get there...
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Solved Re: CPU Or Load Throttling With HT Enabled? Help

Post by smduff on Tue Apr 27, 2010 5:57 pm

I have a little sumpin sumpin up my sleeve as well.
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Solved Re: CPU Or Load Throttling With HT Enabled? Help

Post by McstylisT on Wed Apr 28, 2010 6:42 am

Well done on this mate. You are really getting a fine idea of how this works and with solid stability too.

I believe you CAN achieve a stable 4.2ghz. Though with this clock it changes the settings quite a lot. You would need at least 1.28v - 1.32 on the CPU and some more on the PPL/VVT as well. Its only 200mhz but such a big jump with regards to the pushing your doing on the chip.

Personally i never notice anything different from 4.2ghz over 4ghz. Temps went mental and that was it really for me.

Seeing your results in the other thread you have plenty of head room to test with. So dont worry too much about upping the voltage. As long as you keen inside intels recommended range , which i think is 1.375v for an i7. Though never seen one need much more than 1.32v for this clock.

Great work , and thanks for sharing all this.

McT :D

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Solved Re: CPU Or Load Throttling With HT Enabled? Help

Post by 4hams on Wed Apr 28, 2010 6:54 am

Thanks Craig. It is fun tinkering with it and frustrating at the same time. The Domino ALC I use for cooling is a great little unit but 4.2 GHz is really pushing it with the temps so I am very pleased where it is. smile
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Solved Re: CPU Or Load Throttling With HT Enabled? Help

Post by McstylisT on Wed Apr 28, 2010 7:11 am

4hams wrote:Thanks Craig. It is fun tinkering with it and frustrating at the same time. The Domino ALC I use for cooling is a great little unit but 4.2 GHz is really pushing it with the temps so I am very pleased where it is. smile

You are so right Joel.

This is a sign of a knowledgeable clocker. :D Content with achievement , and in tune with his equipment.

If people can follow your lead they wont go far wrong mate. :yourock:

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