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  1. #11
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    Re: 8700K Temperature Check - Which application?

    It's simple, the third-party utilities like Core Temp are reading the absolute CPU temperature directly from the chip, while your motherboard is applying some sort of negative offset (presumably being determined by its own temperature sensors) to provide you with a "relative" CPU temperature. As you've already seen, the latter isn't particularly useful, and I'd ignore it.

    How do I know this? Well, you have stated that your ambient temperature is around 25 degrees Celsius, yet the BIOS is reporting a CPU temperature of under that value, i.e. below ambient. Basic physics means that it is impossible for a standard air or water cooler like your H80i to cool something to below ambient.

    Always assume the highest temperature reported is the correct one.

    As for voltage tuning, of course dropping VCore from 1.45v to 1.1v (a ~25% decrease) is going to have a massive effect on your temperatures. The "auto" VCore setting only exists for those who want their overclock to work without having to worry about stability testing, and the only way to guarantee a stable overclock (assuming the chip is capable of it) is by pushing volts through it.

    If you are anything more than incredibly lazy, you will always get a much better result by applying a voltage offset, then tweaking it up or down based on stability and temperatures. Yeah, you might get a few blue screens if you pull the voltage too low, but that's part of the fun of tweaking.

    BTW, 4.7GHz @ 1.1V without delid is quite a nice result. These chips seem to need around 1.4V for 5GHz, and you've already been at 1.45V so you could probably hit those clocks with ease (assuming your chip is capable). Personally I'd try a once-off 5GHz run just to see if the chip can do it, then back off to 4.7GHz or less for daily use.

    OT: Seems like Intel's 14nm process has finally come good with the "14nm++" they are using for Coffee Lake, considering that 6-core Coffee Lake chips clock higher at lower volts than their 4-core Kaby Lake predecessors.
    saving for emigration | Maxwell 2 (GTX 9x0) BIOS tweaking

  2. #12
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    Re: 8700K Temperature Check - Which application?

    Here is the result from mine, as you can see the fucker runs hot:

    IBT_Res7700K.jpg
    Last edited by Valheru; 29-12-2017 at 10:33 AM.

  3. #13
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    Re: 8700K Temperature Check - Which application?

    Quote Originally Posted by Valheru View Post
    Here is the result from mine, as you can see the fucker runs hot:

    IBT_Res7700K.jpg
    Like I said, Coffee Lake runs quite a bit cooler than Kaby Lake, despite having 2 more cores.
    saving for emigration | Maxwell 2 (GTX 9x0) BIOS tweaking

  4. #14
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    Re: 8700K Temperature Check - Which application?

    Auto voltage strikes again

    Lately I use the CPU (PECI) reading in HwInfo
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  5. #15
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    Re: 8700K Temperature Check - Which application?

    Auto voltage is a sinner of note, and yes Assimilator is correct. Your bios and msi app are sucking thumbs, on standard air/water cooling room temp is the lowest your cpu will go.
    ASUS X99-A | 6800k | Corsair H105 + 2x ML120 | Ripjaws V 16GB 3000mhz CL15 | ASUS GTX1080 TI Strix OC | Creative SB-ZxR | Cooler Master Haf-X | Logitech G502 | Logitech G710+ | Corsair RM1000x | LG OLEDE6V |

  6. #16
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    Re: 8700K Temperature Check - Which application?

    Thanks for the feedback gents!

    I'll focus on HWMonitor and MSI AB for now (I always run MSI AB, so might as well).

    That being said, I have some very good results in terms of undervolt on both the GPU and CPU. I'm currently running 4.8GHz with 1.135v. I could only get to a stable 5GHz OC using 1.3v or 1.31v - using mode 4 LLC. However, the difference in temperature between 4.8 vs 5.0GHz is quite rough. Currently, while using the 4.8GHz configuration, the Intel Burn Test load lets the CPU go up to almost 60c. Using 5GHz OC the load of IBT takes the CPU up to 73c :-(

    I'll try the 5GHz OC in the winter again - for now the 4.8GHz should be more than enough!
    | i7 8700K || EVGA GTX1080 FE || MSI Z370 Tomahawk || Corsair H80i V2 || CM MasterGel Maker || 16GB Corsair RGB DDR4 3466 || Antec TP-750-C || CM MasterBox Lite 5 || Acer GN246HL 144Hz |

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