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Thread: CPU cycling at idle and some other questions




  1. #1
    boondocks's Avatar
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    Default CPU cycling at idle and some other questions

    Please allow my uneducated questions and observations, sorry for long post;
    1) Using hwinfo64 (latest) , I"m noticing the cpu cores cycling from 1.604 up to 4.513 and back at idle after the machine has been on without reboot overnight, only running uTorrent. Why is this?
    2) Also the core voltage reading on cpuid seems to accurately show the Vtt, I thought it was supposed to show Vcore?
    3) After extensive operation and reboot, BIOS shows core temps in the mid 30's, although after boot the temps rise to about 40 and stay there as reported by CoreTemp and hwinfo64.

    My overclocking has hit a wall due to high temps, yesterday I saw 88*c during Prime95 (latest version) and stopped the program. At this point Vcore setting is 1.380, anything lower and I BSOD 0124.
    Vtt is 1.065, although in BIOS Vcore and Vtt numbers read higher on the current status page. What else, oh, PLL is set at 1.75.
    If Vtt is left on Auto I get BSOD 0101, so as I said at this point is bumped to 1.068.

    I have removed the Hyper 212+ cpu cooler and reapplied thermal paste (the paste from Noctua because I had some) but no change in temps. I added a 120mm vortex fan to the case side and tried both high and low positions, pulling and pushing air from the case, and I have added a second fan to the 212 so it's in push/pull configuration but no relief on the temps. (looking at better cpu coolers, but still don't understand why temps so high)

    So to summarize:
    Turbo clocks set x45
    Vtt set 1.065
    Vcore set 1.380
    Pll set 1.75
    High core temperatures a problem

    comments more than welcome, I have to be out this morning but will check back this afternoon.
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  2. #2
    Acebmxer's Avatar
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    Default Re: CPU cycling at idle and some other questions

    To me it all sound about normal. By normal I mean no software out there is 100% perfect. I would not trust hwinfo64 for voltage reading or for core temp monitoring. For voltages I would use ET6 to see what Auto is setting but still that is only going to show you what is being set not what is currect as voltage will change from what is set in bios to what you see at idle to what you see at load. This goes for the bios also, you can set vcore to 1.4v but after reboot and enter bios it may show 1.375 or 1.395 but in windows it may show 1.39, 1.375 or less then when you load it could be more. This call Vdrop and Vdroop. All natrual and something you have to fight against. LLC for vcore was implimented to help fight against this for vcore.

    I strongly recommend using Real Temp to monitor core temps, its a light program (file size and resources and is updated more offten). Cpu-z should be used to read vcore and cpu speed.

    With software you have to make sure you are using the latest version of it and compair it to other software not just 1 to say its wrong.
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  3. #3
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    Default Re: CPU cycling at idle and some other questions

    could try a lower llc and more dvid,higher llc tend to make the cpu speed/voltages jump around more at idle
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    Default Re: CPU cycling at idle and some other questions

    Quote Originally Posted by boondocks View Post
    Please allow my uneducated questions and observations, sorry for long post;
    1) Using hwinfo64 (latest) , I"m noticing the cpu cores cycling from 1.604 up to 4.513 and back at idle after the machine has been on without reboot overnight, only running uTorrent. Why is this?
    2) Also the core voltage reading on cpuid seems to accurately show the Vtt, I thought it was supposed to show Vcore?
    3) After extensive operation and reboot, BIOS shows core temps in the mid 30's, although after boot the temps rise to about 40 and stay there as reported by CoreTemp and hwinfo64.

    My overclocking has hit a wall due to high temps, yesterday I saw 88*c during Prime95 (latest version) and stopped the program. At this point Vcore setting is 1.380, anything lower and I BSOD 0124.
    Vtt is 1.065, although in BIOS Vcore and Vtt numbers read higher on the current status page. What else, oh, PLL is set at 1.75.
    If Vtt is left on Auto I get BSOD 0101, so as I said at this point is bumped to 1.068.

    I have removed the Hyper 212+ cpu cooler and reapplied thermal paste (the paste from Noctua because I had some) but no change in temps. I added a 120mm vortex fan to the case side and tried both high and low positions, pulling and pushing air from the case, and I have added a second fan to the 212 so it's in push/pull configuration but no relief on the temps. (looking at better cpu coolers, but still don't understand why temps so high)

    So to summarize:
    Turbo clocks set x45
    Vtt set 1.065
    Vcore set 1.380
    Pll set 1.75
    High core temperatures a problem

    comments more than welcome, I have to be out this morning but will check back this afternoon.
    1. Sounds like you have speedstep enabled still (C1E, and EIST, possibly C3/C6 also)
    2. Use the latest BIOS, and the latest version of CPU-z, then it will show Vcore not Vtt
    3. BIOS only shows CPU temps, not core temps

    I think you need a much larger cooler if you want to push overclocks/voltages any higher, the Hyper 212+ is a semi-budget range cooler, intended for mid-range overclocks while still having a decent price.

  5. #5
    boondocks's Avatar
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    Default Re: CPU cycling at idle and some other questions

    Quote Originally Posted by Acebmxer View Post
    To me it all sound about normal. By normal I mean no software out there is 100% perfect. I would not trust hwinfo64 for voltage reading or for core temp monitoring. For voltages I would use ET6 to see what Auto is setting but still that is only going to show you what is being set not what is currect as voltage will change from what is set in bios to what you see at idle to what you see at load. This goes for the bios also, you can set vcore to 1.4v but after reboot and enter bios it may show 1.375 or 1.395 but in windows it may show 1.39, 1.375 or less then when you load it could be more. This call Vdrop and Vdroop. All natrual and something you have to fight against. LLC for vcore was implimented to help fight against this for vcore.

    I strongly recommend using Real Temp to monitor core temps, its a light program (file size and resources and is updated more offten). Cpu-z should be used to read vcore and cpu speed.

    With software you have to make sure you are using the latest version of it and compair it to other software not just 1 to say its wrong.
    OK. I have RealTemp v3.70, I do use it sometimes-seems that all the temp readings from different programs follow pretty closely on average.
    I have been using ET6 to take "snaphots" with the snipping tool to help me keep up with settings.
    Thanks, especially for the tip on LLC - I didn't know that.
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  6. #6
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    Default Re: CPU cycling at idle and some other questions

    Quote Originally Posted by wazza300 View Post
    could try a lower llc and more dvid,higher llc tend to make the cpu speed/voltages jump around more at idle
    What is dvid called in Gigabyte BIOS?
    I'll try some more LLC adjustments. Right now I really need another cooler before I can go any further, looking at Noctua NH-D14 & the Phantex, trying to figure out which if any will give more RAM clearance.
    After Prime 95 finishes the 448K round in blend test the temps are really shooting up and I'm not brave enough to go to 90*c.
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  7. #7
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    Default Re: CPU cycling at idle and some other questions

    Quote Originally Posted by Lsdmeasap View Post
    1. Sounds like you have speedstep enabled still (C1E, and EIST, possibly C3/C6 also)
    2. Use the latest BIOS, and the latest version of CPU-z, then it will show Vcore not Vtt
    3. BIOS only shows CPU temps, not core temps

    I think you need a much larger cooler if you want to push overclocks/voltages any higher, the Hyper 212+ is a semi-budget range cooler, intended for mid-range overclocks while still having a decent price.
    EIST is disabled. Will post more about this when I take another look at the BIOS.
    I'm using F9g BIOS-it should be the same as F9, or is it not? I went to F9g shortly after installing the board because of boot loops and it seemed to cure the problem for me.
    what is difference between cpu temp and core temp? The BIOS has 4 separate readings for the cpu on one screen, and on another screen shows what I assume is the single package temp?
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    Default Re: CPU cycling at idle and some other questions

    Quote Originally Posted by boondocks View Post
    What is dvid called in Gigabyte BIOS?
    I'll try some more LLC adjustments. Right now I really need another cooler before I can go any further, looking at Noctua NH-D14 & the Phantex, trying to figure out which if any will give more RAM clearance.
    After Prime 95 finishes the 448K round in blend test the temps are really shooting up and I'm not brave enough to go to 90*c.
    i have the noctua,but im using low profile ram,max temp at 4.5ghz is 71c,ive got some mx4 to apply though,dvid is called dvid,are you running a fixed cpu voltage? it will only unlock dvid if cpu voltage is set to auto or normal
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  9. #9
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    Default Re: CPU cycling at idle and some other questions

    Cpu temp is supposed to be the physical temp of the cpu is self. This will never be accurate as there is no sensor in the cpu to read its temp. The sensor that this temp comes from is located in the motherboard. The only way to get a accurate read is to have a sensor in between the cpu and the heatsink. This is also know as Tjcase

    Core temps are the temps of the physical cores in side the cpu. These are used for throttling only, people have started using them for temp readings as you can when the cpu is about to start to throttle. Each cpu has a max temp at which is start to throttle for my i7-920 its 100c this is Tjmax.

    Core temps can be in accurate at colder temps as they are only see when the tjmax is going close to start throttling to save the cpu. You may see that each core temp might not read the same. It could be possible issue with thermal paste or how the cpu cooler is mounted. If after remounting the cooler temps still read the same then some chips have different Tjmax to help with throttling. So all 4 or more cores dont all shut down at once even if it is for micro seconds.

    It is suggested that you keep core temps 20c from tjmax. Most cpus are around 100c for tjmax so we usally say to keep core temps at or under 80c. In theory the cpu should start to throttle from hitting Tjmax before hitting Tjcase unless your cpu cooler fell off and is just hanging there.
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  10. #10
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    Default Re: CPU cycling at idle and some other questions

    Quote Originally Posted by wazza300 View Post
    i have the noctua,but im using low profile ram,max temp at 4.5ghz is 71c,ive got some mx4 to apply though,dvid is called dvid,are you running a fixed cpu voltage? it will only unlock dvid if cpu voltage is set to auto or normal
    OK. Had to set Vcore from "Auto" to "Normal to unlock dvid. But the system did not like it and would not boot. For now I set it back to "Auto".
    BTW ordered Noctua, will deal with RAM when/if I see the fitment. Site says my RAM compatible. :shrug:
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