Is the safe operating voltage for a CPU the one set in BIOS or after vdroop?

Discussion in 'OT Technology' started by Danno, Jul 20, 2008.

  1. Danno

    Danno Bronx Poodle OT Supporter

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    Say I set the voltage for 1.4V in BIOS but after vdroop it reads at 1.36 in windows (CPU-Z), which one do you go by? I think the limit Intel has for the E8400 is 1.36.
     
  2. lowfat

    lowfat 24/Mac/SciFi/PC Crew OT Supporter

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    If you think 0.04V is going to make a different, you are wrong. Also you are using software to read the voltage, which is also wrong. Either way I wouldn't worry about it.
     
  3. Danno

    Danno Bronx Poodle OT Supporter

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    I'm not worrying about the .04 difference in voltage, just trying to figure out where that voltage is set (in windows when it's actually getting used, or in BIOS).
     
  4. lowfat

    lowfat 24/Mac/SciFi/PC Crew OT Supporter

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    BIOS. Like I said software readings are usually incorrect.
     
  5. XR250rdr

    XR250rdr OT Supporter

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    Just because you set the voltage in the BIOS to be 1.4V that doesnt mean it is going to always be 1.4000000V. There is tolerance in all the parts and the controller is supposed to just keep the voltage regulator output to within a set tolerance range.

    If an engine ran the same kind of tolerances that a motherboard did it would never get close to running.
     
  6. skinjob

    skinjob Active Member

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    vdroop is not the difference between what you set in bios and what you actually measure. vdroop is the difference in voltage between the CPU at idle and the CPU under load. Run CPU-z and start something like prime95. The small drop in voltage you see is the vdroop.
     
  7. Danno

    Danno Bronx Poodle OT Supporter

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    Yeah, figured that out after I posted...i'm new to it all.:o
     
  8. deusexaethera

    deusexaethera OT Supporter

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    .04v won't change heat output, but it can definitely destabilize the core.

    (goddamn it's fun to say "destabilize the core" and not sound like a fucking dork.)
     
  9. XR250rdr

    XR250rdr OT Supporter

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    If Intel says its within operating operating tolerances then no it won't.
     

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