How to Calculate Overclocked Power Consumption

Discussion in 'Die-hard Overclocking & Case Modifications' started by G L, Jun 30, 2004.

  1. perera

    perera Active Member

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    x800gto 512mb 580/1200
    but what about the fsb? overclocking it also changes the wattage?


    and actually its a p4, and it is in the top of its series

    i did the math on that power supply test, and i got 320 watts ..and im still with a generic agps400q of vcom... lol

    she really does suffer, i already got 11.3 volts on 12+ with it
     
    Last edited: Jul 27, 2005
  2. G L

    G L Don Juan

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    Well, guess I might as well give a newer example than the old beloved Athlon XP. Here's the Intel 6xx series datasheet:

    ftp://download.intel.com/design/Pentium4/datashts/30638202.pdf

    If you go to page 76, you'll see that the TDP of the 3.8 GHz P4 670 is listed as 115 watts, and the vcore is rather confusingly specified as 1.2 to 1.4 volts on page 25, though of course if you own the processor in question you just use hardware monitoring to see what vcore you're running. I'll use what is apparently the worst-case scenario, 1.4v.

    So let's say we OC to 4.2 GHz, which apparently is quite attainable with sufficient power and good cooling, and let's say that requires 1.6 volts. That gives us:

    OC Wattage = TDP * (OC MHz / Stock MHz) * (OC Vcore / Stock Vcore)^2

    OC Wattage = 115 * (4200 / 3800) * (1.6 / 1.4)^2

    OC Wattage = 115 * (1.105) * (1.142)^2

    OC Wattage = 115 * 1.105 * 1.304

    OC Wattage = 165.7

    For 166 watts, if you want both decent temps and barable noise you're going to want a fairly monstrous heatsink or spring for water-cooling.
     
  3. G L

    G L Don Juan

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    Most directly by changing the CPU speed... but changing the FSB will also overclock the chipset, which would presumbably also increase wattage. Though if you knew the chipset TDP and voltages, you could presumbably run the same equation for that. RAM is another one, but same deal. Though I don't think chipset and ram consume much more than 25 watts each stock. CPU and video card can both consume over 100 watts each, but after that I'd be suprised if the rest of the system combined topped 65 watts, assuming you're not running a DC pump or TEC module off your power supply, of course.
     
  4. perera

    perera Active Member

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    changin a bit the subject, i know that the recommended +- voltage is 5% , but im gettin somtimes 11.3 volts at 12+..is it that bad?
     

  5. G L

    G L Don Juan

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    Sounds pretty normal to me... I have a $200 power supply, and I still only have 11.65v right now.
     
  6. perera

    perera Active Member

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    im gettin a seventeam 420 bkv next month..prolly also vantec tornado, if i like it 2 of them... im also buyin the fan controler a2140 for thermaltake..hes at least meant to take the tornados
     
  7. Gamu

    Gamu Member

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    GPU:
    MSI 6800GT @ Ultra (ItWill be Leadtek 7800GTX)
    Is this a Real A64 Model Number?:

    ADA3500DAA4BP
    LBBLE 0516MPM
    4424684F51654

    Because, it's only 3 letters in the end of the 2nd line...

    PLs. Hurry, I need this!
     
  8. G L

    G L Don Juan

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    Repost this somplace else, please, this thread is for something else entirely.
     
  9. redtzm_96

    redtzm_96 Member

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    erh.. here a dummy Q from me.. what is the tdp..? eheh
     
  10. G L

    G L Don Juan

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    Thermal design power, basically power consumption/heat dissipation at load. So if you read a review that says a P4 3.8 GHz can dissipate up to 115 watts, that's its TDP. No way to reason it in the abstract, so you have to check the manufacturer's specs for that. I've seen TDP used interchangably to indicate both power consumption and heat dissipation, so apparently all power consumption is converted into heat.
     

  11. Kain

    Kain Ancient Guru

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    Very nice information.
    I have never seen this thread.

    Now, i know if i can OC a lot my processor.

    G L. Here is a question.

    I have the PSU in my Specs.

    Now, im upgrading to socket 939 and PCI-E.

    Im bought an Opteron 146 CABYE 0540 which im panning to OC to 3.0 ghz or soo
    Also i will be using an DFI SLI Infinity mobo
    And finally i will be getting a 6800GS the next week.

    So, the specs for my system will be the same except for the above mentioned.

    I used the very usefull link you gave to calculate the wattaga and it scored about 30 to 340 watts (depending on how you said to double the DDR wattage).

    My PSU should be enough to handle this system right?
    In that case, i have about 80 watts leaving which should be used for the OC consumption, right?

    Is this safety? Or, should i buy another PSU before OCing?

    Also, this PSU shows it supports a maximum peak of 500 watts.
     
  12. r00723r0

    r00723r0 New Member

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    Wow, uhh... It's basic algebra... You might as well learn algebra before overclocking :p

    In any case, I know that a 33% increase is about tops for voltage, but what about wattage? Does it depend on the dissipation power of the cooler?
     
  13. Shamil

    Shamil Member

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    GPU:
    eVGA 6600GT 128mb AGP w/VF700cu
    I have calculated that overclocking my P4 from 3ghz to 3.4ghz will require 102 watts @ peak... Good equation, thank you.


    Only problem is I have no idea what the TOTAL power requirements will be on my PSU, and this thread has not helped me determine that at all.


    I am using 2x 80mm fans in the front, 1x 80mm fan in the back, 1x 80mm on top (all Vantec Stealths, top fan is a Panaflo). I have another 80mm 2700rpm on top of the CPU.

    I am using a 6600GT 128mb AGP overclocked to 570/1060 (no volt mods: AGP slot default @ 1.55v)

    4x512mb of DDR400 RAM over-volted to 2.7v

    I have a Sound Blaster Audigy 2 which is soft-modded into an Audigy 4.

    And I have a USR wireless network PCI card @ 125mbps.


    I also have 1x Seagate 120gb SATA and 1x Western Digital 250gb.


    Is there ANY way to determine if this will cause problems for my 420 watt Enermax Noisetaker??
     
  14. Dublin_Gunner

    Dublin_Gunner Ancient Guru

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  15. BuildeR2

    BuildeR2 Ancient Guru

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    Hmm, I just use a program called OCRechner to do those sort of calculations. It has helped me alot with OC'ing and it also has RAM ns calculations.
     

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