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Thread: Z87 Extreme6, to change System Agent Volt Offset, but what is the base value?




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    Angry Z87 Extreme6, to change System Agent Volt Offset, but what is the base value?

    Hi all,

    it's confusing, the VCCSA offset range is [-1, 1], but what is the base value? How can I know the exact VCCSA value ?

    By reading some threads, it seems that the recommended max value for VCCSA is 1.25.

    Thanks and regards

  2. #2
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    Default Re: Z87 Extreme6, to change System Agent Volt Offset, but what is the base value?

    Good question and as you know not easy to answer. Is the base/default value shown in any UEFI/BIOS? As you said, all we can see is the offset voltage, same for the Analog and Digital I/O voltages.

    I searched through Intel Haswell processor documents, could not find it. The closest thing I could find is what Intel calls VCCIO_TERM, or VCCIO termination voltage, and VCCIO_OUT. Both have a value of 1.0V.

    Actually, VCCSA, etc, may be based off of VCCIO_TERM or VCCIO_OUT, it is either VCCIO value multiplied by a factor, 0.7 or 0.9 for example. Another hint I found said the voltages based on VCCIO vary by processor "family", which may be why Intel does not give a spec.

    Another possibility is that VCCSA can vary depending on the CPU load, so an offset is all that is needed.

    I've seen nothing that displays VCCSA as a value, including IXTU.

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    Default Re: Z87 Extreme6, to change System Agent Volt Offset, but what is the base value?

    Quote Originally Posted by parsec View Post
    Good question and as you know not easy to answer. Is the base/default value shown in any UEFI/BIOS? As you said, all we can see is the offset voltage, same for the Analog and Digital I/O voltages.

    I searched through Intel Haswell processor documents, could not find it. The closest thing I could find is what Intel calls VCCIO_TERM, or VCCIO termination voltage, and VCCIO_OUT. Both have a value of 1.0V.

    Actually, VCCSA, etc, may be based off of VCCIO_TERM or VCCIO_OUT, it is either VCCIO value multiplied by a factor, 0.7 or 0.9 for example. Another hint I found said the voltages based on VCCIO vary by processor "family", which may be why Intel does not give a spec.

    Another possibility is that VCCSA can vary depending on the CPU load, so an offset is all that is needed.

    I've seen nothing that displays VCCSA as a value, including IXTU.
    Thank you so much for your detailed explanation, it seems that I just need to keep the offset value as low as possible, or it will damage the CPU permanently.

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    Default Re: Z87 Extreme6, to change System Agent Volt Offset, but what is the base value?

    Thank you for that. A little strange they give us such a wide range of offset voltage, +/- 1V, when that seems to be to much. But we can set other voltages to dangerous levels, so why not this one...

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