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  1. #1
    ROG Guru: White Belt Array Rippin Kittin PC Specs
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    Stressed CPU generates more heat? - I7 4790K (Haswell)

    As far as I know, temps should increase the more voltage you put on the CPU.
    I have overclocked this processor since day one, but recently made an adjustment
    of the voltage after seeing an x quantity of blue screens...

    I have made changes from the following:



    Cores: 45
    Minimum core cache: 45
    Highest-core cache: 45

    Cores: 1.280 V.Core
    Core Cache: 1.280 V.Core

    Initial output voltage: 1.830
    Eventual output voltage: 1.780


    (unstable values)



    to...



    Cores: 45
    Minimum core cache: 45
    Highest-core Cache: 45

    Cores: 1.290 V.Core
    Core cache 1.275 V.Core

    Initial output voltage: 1.870
    Eventual output votage: 1.820


    (stress tested two days and so far stable)


    What puzzles me is that the CPU runs cooler with the new OC that runs with higher voltage than the first one. I'm talking a difference of about 5°C. Ambient temps have not changed at home but remains steady at 19°C all the time. So what can be the reason?


    #1 - The processor must work harder when it's stressed from not eating enough voltage, hence generates more heat?
    #2 - The heat is just being transfered to another place?



    Someone here told me:

    "That's about right, Rippin Kittin. You're seeing a strange artifact of the Haswell integrated voltage regulators. Those regulators turn out a constant power for constant Vcore and software load. When driven with low Vccin, the FIVR draws more current to make up the power. With increased voltage, current is reduced. Current in the FIVR produces heat, while higher voltage lets the regulators run more efficiently. The lower temperatures hold over a range of Vccin up over 1.90 somewhere."
    Last edited by Rippin Kittin; 02-16-2017 at 08:13 AM.
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  2. #2
    Banned Array JustinThyme PC Specs
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    Am I seeing correctly? Cant be a typo as its entered more than once. You have Vcore up to 1.8 and then some? Holy Chip explosion!

  3. #3
    ROG Enthusiast Array Johan45's Avatar
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    Pretty sure the voltage he's relating is VCCIN

  4. #4
    ROG Guru: White Belt Array Klute_Onren PC Specs
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    gotta be some sort of a fluke, you barely raised the voltage so it's anyones guess why the temps went down.

  5. #5
    ROG Guru: White Belt Array Rippin Kittin PC Specs
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    Quote Originally Posted by JustinThyme View Post
    Am I seeing correctly? Cant be a typo as its entered more than once. You have Vcore up to 1.8 and then some? Holy Chip explosion!
    Yes, you were reading it wrong...
    CPU: Intel Core i7-8700K @ 5.1 GHz || MB: ROG Strix Z370-F Gaming || Cooling: Corsair Hydro 115i
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    Case: NZXT Phantom 820 FullTower - White



  6. #6
    ROG Guru: Blue Belt Array jab383 PC Specs
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    That's about right, Rippin Kittin. You're seeing a strange artifact of the Haswell integrated voltage regulators. Those regulators turn out a constant power for constant Vcore and software load. When driven with low Vccin, the FIVR draws more current to make up the power. With increased voltage, current is reduced. Current in the FIVR produces heat, while higher voltage lets the regulators run more efficiently. The lower temperatures hold over a range of Vccin up over 1.90 somewhere.

  7. #7
    ROG Guru: White Belt Array Rippin Kittin PC Specs
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    Laptop (Model)Lenovo Ideapad Y700 14"
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    MonitorASUS 27" ROG SWIFT PG279Q - 165Hz
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    Quote Originally Posted by jab383 View Post
    That's about right, Rippin Kittin. You're seeing a strange artifact of the Haswell integrated voltage regulators. Those regulators turn out a constant power for constant Vcore and software load. When driven with low Vccin, the FIVR draws more current to make up the power. With increased voltage, current is reduced. Current in the FIVR produces heat, while higher voltage lets the regulators run more efficiently. The lower temperatures hold over a range of Vccin up over 1.90 somewhere.
    You seem to know what you're talking about. I have noticed it without knowing where to put my finger on it.
    The temps do seem to get a bit lower when you hit the right spot somehow.

    If anyone else has a theory I'm open to hear about it.
    Last edited by Rippin Kittin; 02-16-2017 at 08:11 AM.
    CPU: Intel Core i7-8700K @ 5.1 GHz || MB: ROG Strix Z370-F Gaming || Cooling: Corsair Hydro 115i
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    Case: NZXT Phantom 820 FullTower - White



  8. #8
    ROG Guru: White Belt Array Rippin Kittin PC Specs
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    Quote Originally Posted by Johan45 View Post
    Pretty sure the voltage he's relating is VCCIN
    She
    Last edited by Rippin Kittin; 02-16-2017 at 08:10 AM.
    CPU: Intel Core i7-8700K @ 5.1 GHz || MB: ROG Strix Z370-F Gaming || Cooling: Corsair Hydro 115i
    GFX: 2 x GeForce GTX 1080 Ti 11GB (SLI) || RAM: G.Skill Trident Z RGB 32GB OC @ 3300 MHz
    Keyboard: Logitech G910 Orion Spectrum || Mouse: Logitech G502 Proteus Spectrum
    Monitor: ASUS 27" ROG SWIFT PG279Q 165Hz || PSU: Corsair AX1600i || OS: Windows 10 Professional x64
    Case: NZXT Phantom 820 FullTower - White



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