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Thread: Is CPU (watt) meter in DES Advanced accurate?




  1. #1
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    Default Is CPU (watt) meter in DES Advanced accurate?

    HI:

    I'm wondering if anyone knows how accurate the CPU (watt) meter in the DES Advanced software is? The reason I'm asking is that my Intel E5200's max TDP is 65W, yet the highest I've seen the CPU meter on the DES is around 30W (20% OC - only FSB increase, running Prime 95, task manager showing 100% load with all 6 gears activated).

    Its hard to believe the CPU is generating ~50% less power than its rating when running at 100%.

    System Info:
    CPU: Intel E5200
    MB: EP45-UD3R
    DES Advanced v1.1 B9.0316.1

  2. #2
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    Default Re: Is CPU (watt) meter in DES Advanced accurate?

    A processors TDP does not necessarily represent the amount of powr a CPU will draw. for a short explanation see: Thermal design power - Wikipedia, the free encyclopedia .

    No software is accurate for sensing power drawn in regard to PC components. I would take any reading for wattage and amperage in software with a pinch of salt. Voltages can be reasonably accurate, but again they're certainly not precise. Something more sophisticated would be needed. A more accurate way of measuring would be to use a DMM. Measuring amperage in the right place would allow you to calculate the power consumption of the component using the equation P = V * I Where P = power in watts, V = voltage and I = current in Amperes.
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  3. #3

    Default Re: Is CPU (watt) meter in DES Advanced accurate?

    You can't use just Ohm's Law on CPUs, I am told. They are not a standard circuit. They use something called displacement current. Here is a Post where calculating Power for a CPU was explained to me.
    Quote Originally Posted by Alex St. John
    Consider for a moment that what we think of as “intelligence” is the byproduct of a computing architecture that depends on massive parallelism to interact with the world in real time without stalling for progress bars. If our ancestors’ brains had depended on running Vista on current dual-core processors for their survival, they would have been eaten by bears.

    Best Quote Ever...
    Quote Originally Posted by Psycho101
    Obey the one and only rule without question when you overclock.... don't cause a fire. Fires are hot and burny... not good.
    Intel E8400 EO@445x9--Gigabyte EP45-UD3P v1.1 ~ F9--EVGA 9800GT @ 700/1750/1100--8GB Gskill 1066

  4. #4
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    Default Re: Is CPU (watt) meter in DES Advanced accurate?

    I see. So put simply one would need to know C and F as well as the already known V. I have no idea how to find the capacitance of a CMOS based CPU, and I have a feeling it's not in the spec sheet either.

    Although not measuring CPU power consumption directly, is it possible to at least calculate what's being drawn through the FETs and/or chokes (which ever require measuring, not sure personally)?

    I believe that some equipment used to rest power drawn from a PSU and to bench mark it (as seen in PSU lab/group tests) can cost many thousands of pounds/dollars/beer tokens. I assume something capable of measuring the power draw of a CMOS IC and displaying it in a readable format would either be as expensive or as obscure?
    Coolermaster CM 690 II advance Case
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    TRUE Black with a single Noctua NF-P12 pumping out 55 CFM @ 19db .
    2 x 2GB Mushkin Ridgeback (996902), @ 7-10-8-27, 2010-DDR, 1.66v
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  5. #5
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    Default Re: Is CPU (watt) meter in DES Advanced accurate?

    I think that 30W max from a E5200 sounds resonable from what I've read. Furthermore, apparently you should be seeing something like 28W difference between idle and heavy load, see last post (just remember that what is cited is system power draw).

  6. #6
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    Default Re: Is CPU (watt) meter in DES Advanced accurate?

    Thanks guys - I forgot how good Silent PC Review is. Their article that was footnoted in Wikipedia states that Intel CPU power consumption is actually higher than their TDP rating. Unfortunately, none of their numbers cited are for the Core 2 design.

    I did find that the difference between my idle and load power rating was 28W, as FreddyAV mentioned. I'd like to find out how the poster in SPCR tested the "... power consumption in Windows" as his numbers 65W loaded and 36W idle are very closer to Intel specs

  7. #7

    Default Re: Is CPU (watt) meter in DES Advanced accurate?

    Not knowing how software like Everest does what it does, I would hesitate to answer the question of how to find capacitance etc... I am sure that the white sheets or other engineering papers from Intel or GIgabyte would tell us, if we could get our hands on them.

    It is worth noting, however, that if the BIOS can report voltages in System Health then it is possible for software to extrapolate things like amperage, capacitance, resistance, and wattage.
    Quote Originally Posted by Alex St. John
    Consider for a moment that what we think of as “intelligence” is the byproduct of a computing architecture that depends on massive parallelism to interact with the world in real time without stalling for progress bars. If our ancestors’ brains had depended on running Vista on current dual-core processors for their survival, they would have been eaten by bears.

    Best Quote Ever...
    Quote Originally Posted by Psycho101
    Obey the one and only rule without question when you overclock.... don't cause a fire. Fires are hot and burny... not good.
    Intel E8400 EO@445x9--Gigabyte EP45-UD3P v1.1 ~ F9--EVGA 9800GT @ 700/1750/1100--8GB Gskill 1066

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