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Thread: Find out the Max Case Temperature and Max Power draw of your CPU

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  1. #9
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    I updated the program and the description of the program, I also explain the purpose of MaxTCase value.
    Can someone please change the title of the thread to "Find out the Max Case Temperature and Max Power draw of your CPU", please?
    So redownload it (should be v1.10) and check it out, enjoy

    This is a quote of the first post
    Quote Originally Posted by The Coolest
    This is a new type of program, which checks AMD64 CPUs for their maximum rated case temp or TCaseMax and reports the TDP which corresponds to the processor in question.
    On most AMD processors TCaseMax and TDP values are constant, and depend on CPU type and model, but on the E Revision chips, both this values and the default voltage are variable.
    These are the chips that have variable values:
    Athlon64 (Venice, San Diego)
    Athlon64 FX (San Diego)
    Athlon64 X2 (Manchester, Toledo)
    All Rev E Opterons and Dual Core Opterons

    What this all means is this: On 90nm manufacturing process, the power leakage of transistors on individual processors differs greatly, this is why AMD implemented TCaseMax. Each CPU has a different TDP rating, here's how it works:
    A program reads the TCaseMax value off the CPU, then depending on the processor (CPU type like A64, Opteron;CPU Rating like 3500+, 146) it finds the processor's Thermal Profile (If you download the "AMD Opteron™ Processor Power and Thermal Data Sheet" and look at pages 10-11 you'll see the different thermal profiles). When the thermal profile is determined, the program finds the TDP rating that corresponds to the CPU's TCaseMax value.
    So in a few words, the higher the TCaseMax, the higher the TDP of a processor will be (the transistor leakage is higher), so the processor will run hotter. Several people have reported that the Opterons rated at 71C TCaseMax were pretty hot. On the other side these processors will be able to reach higher clock speeds.
    That is why we see that on average processors with higher TCaseMax can usually reach higher CPU speeds when overclocked.
    Every CPU type (A64, FX, X2, Opteron, DC Opteron) has a different thermal profile, that is why you see that on an FX a TCaseMax rating can be "only" 57C and it'll overclock way better than an A64 with a 57C TCaseMax rating. That is because at 57C TCaseMax, an FX has a TDP of 77W while the A64 has a TDP of 44W.
    Last edited by The Coolest; 11-19-2005 at 02:50 AM.
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    Core Temp - Accurate temperature monitor for Intel's Core/Core 2 and AMD64 processors

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