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Thread: Overclock, heat and power?

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    Senior Member Pob255's Avatar
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    Overclock, heat and power?

    Recently I've been looking for info about the exact effects of overclocking a c2d on temptures and power consumption.

    I found this http://forums.techarena.in/showthread.php?t=674095 wit
    But the maths is to much for my brain atm.
    Something with easy on the eye bar charts would be nice, I'm not after exact numbers here but a good idea of what it's like, esp vs unclocked and other types of cpu

    The 2.0ghz c2d is cooler and uses less power than a p4 3.0ghz, but what about when it's overclocked by 50% to 3ghz??

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    Get in the van. Fraz's Avatar
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    Re: Overclock, heat and power?

    Just do it exactly like they say. Typical power usage of a core 2 duo is 65 watts. If you are just doing a simple frequency overclock with no voltage adjustment, the power usage scales linearly with the frequency. So:

    2 GHz C2D = 65 Watts
    Same C2D at 3 GHz = 65 * (3GHz/2GHz) = 97.7 Watts.

    If you have to increase the voltage as well (as is prob necessary to get to 3 GHz from 2 GHZ), then things get more complicated, as power usage scales with the square of the voltage:

    So 2GHz C2D @ 1.4V = 65 W (say... I have no idea what the stock voltage is...)
    so 2GHz C2D @ 1.5V = 65 W * (1.5^2/1.4^2) = 65 W * (2.25/1.96) = 74 Watts.

    And thus a 3GHz C2D @ 1.5 Volts = 65 Watts * (3/2) * (2.25/1.96) = 111 Watts.

    Geddit?

    I think a 3 GHz P4 is about 85 Watts maybe... so definitely a lot more performance per watt in a C2D, as you've got two cores running at 111 Watts (say), rather than a single core running at ~85 Watts
    Last edited by Fraz; 11-09-2007 at 05:24 PM.

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    Senior Member Pob255's Avatar
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    Re: Overclock, heat and power?

    Ahh that makes sense, also means that while a c2d is better at stock and per watt, with overclocks the power and heat really goes up above stock p4's

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