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Thread: CPU cycling at idle and some other questions




  1. #11
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    Default Re: CPU cycling at idle and some other questions

    Quote Originally Posted by Acebmxer View Post
    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.
    The other day I was hitting 88*c while running Prime95 and it seemed to be creeping up.
    Right now I have multis set at 45 and everything on Auto except LLC and it's passing IBT. Will run Prime95 and start making the adjustments as needed.

    Hmmm. Would it be better to set Vcore back to "Normal" (where it did not boot) and start increasing dvid until it's booting??
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  2. #12
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    Default Re: CPU cycling at idle and some other questions

    You have to correctly setup dvid to use it. There are 2 colums in the bios the one on the left is the default/normal voltages. Vid is your cpu's default voltage at default speeds. For my cpu is 1.25 so when vcore is set to normal 1.25v is applied. If auto uses 1.4v for your given over clock and your vid is 1.25 you would need to set dvid to +0.1500 to equal 1.4v. If you need 1.45v then you would use 1.25+0.2000=1.45v. You can also take away voltage with dvid say you only need 1.15v. That would be 1.25-0.1000=1.15v

    Also if you not sure how to use the multi quote just click the ("+) sign next to each post you want to quote including the last one then at the last quote click the (replay with quote) and it will quote all that you have marked.
    Last edited by Acebmxer; 03-24-2012 at 07:33 AM.
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    Default Re: CPU cycling at idle and some other questions

    I would fit you d14 first,above 72c isn't advised for sb,highest id go personally is 80c no higher

    Might need more dvid or a higher llc level,ideally around 1.36v total CPU voltage for 4.5ghz that's whatever normal uses plus dvid amount
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  4. #14
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    Default Re: CPU cycling at idle and some other questions

    Quote Originally Posted by Acebmxer View Post
    You have to correctly setup dvid to use it. There are 2 colums in the bios the one on the left is the default/normal voltages. Vid is your cpu's default voltage at default speeds. For my cpu is 1.25 so when vcore is set to normal 1.25v is applied. If auto uses 1.4v for your given over clock and your vid is 1.25 you would need to set dvid to +0.1500 to equal 1.4v. If you need 1.45v then you would use 1.25+0.2000=1.45v. You can also take away voltage with dvid say you only need 1.15v. That would be 1.25-0.1000=1.15v

    Also if you not sure how to use the multi quote just click the ("+) sign next to each post you want to quote including the last one then at the last quote click the (replay with quote) and it will quote all that you have marked.
    OK, got it, I think. I did not realize the dvid worked that way! I will revisit this when I get better cooling.
    Quote Originally Posted by wazza300 View Post
    I would fit you d14 first,above 72c isn't advised for sb,highest id go personally is 80c no higher

    Might need more dvid or a higher llc level,ideally around 1.36v total CPU voltage for 4.5ghz that's whatever normal uses plus dvid amount
    OK. Every time Prime95 starts the 8K tests, the temps start to cycle from 80-88. Next week when I get the Noctua installed I will get back into. Right now I'll leave the clocks at x45 I guess and not do any testing except I may play with the dvid and IBT instead of Prime95.

    thanks to you guys for the help and I'll probably have more questions next week if I get stuck.
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    Default Re: CPU cycling at idle and some other questions

    ive read that gigabyte boards use more qpi/vtt than stock 1.05v,idk how true this is but if your freezing/bsod ect you can safely use upto 1.2v but no higher,dram can be upto 1.5750v you probably know this already but just making sure,and i wouldnt run above 80c,you dont wanna risk permanently damaging your cpu their not as robust as first gen i7
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  6. #16
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    Default Re: CPU cycling at idle and some other questions

    The dram has been staying on a constant 1.5v as far as I can tell. I have made no adjustments on anything ram related.
    Hopefully I didn't damage anything when I was running 88c in Prime95. It was cycling up and down between about 80-88 in the 8K testing but no BSOD. I let the temps run about 10 minutes into the "high heat" area before I chickened out and stopped P95.

    Was thinking about what Ace said about cooler mounting, paste, etc. I've always had a spread of temps across the cores, with core 4 always about 5c higher than core 1 at idle. I've used several different thermal paste from Cooler Master to Noctua and don't see any differences. Maybe the contact area on the 212 is warped, dunno. I've seen where other people claim to use this cooler with better results than me. :shrug: It's just time to put a monster in there.
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    Default Re: CPU cycling at idle and some other questions

    it depends on your ambient temps too,room temp ect,plus those other users with that cooler might have jet engine 3k rpm fans on them? the noctua is a better cooler all round
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  8. #18
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    Default Re: CPU cycling at idle and some other questions

    Quote Originally Posted by boondocks View Post
    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?
    What about C1E? Also, in the OS power control panel, set High Performance plan, and then in advanced settings set CPU Min/Max to 100%

    I'm not sure if those BIOSes are the same or not, you'd have to try out F9 and see if you like it. And sorry about my confusion, I've never noticed the Z68 boards showed more than one temps for the CPU in the BIOS, are you sure it does?

  9. #19
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    Default Re: CPU cycling at idle and some other questions

    Quote Originally Posted by Lsdmeasap View Post
    What about C1E? Also, in the OS power control panel, set High Performance plan, and then in advanced settings set CPU Min/Max to 100%

    I'm not sure if those BIOSes are the same or not, you'd have to try out F9 and see if you like it. And sorry about my confusion, I've never noticed the Z68 boards showed more than one temps for the CPU in the BIOS, are you sure it does?
    C1 is disabled as well (now). I'm good to go on the OS settings as well.
    Yep, BIOS shows core temp for all 4 cores.
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    Default Re: CPU cycling at idle and some other questions

    Nice! So no more CPU speeds going up and down right?

    Cool to know about the BIOS and CPU temps! I knew they made these boards with better fan and temp control, but I never looked at the BIOS enough to notice that it showed core temps too, very cool to know!

    They need to do that for all boards as no one cares about CPU temp anymore, just cores!

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