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Thread: [AMDocn] Windows 8 Benchmark Records No Longer Accepted At HWBOT / RTC clock bug

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    [AMDocn] Windows 8 Benchmark Records No Longer Accepted At HWBOT / RTC clock bug

    As the result of weekend-time research, the HWBOT staff has decided to invalidate all benchmark records established with the Windows8 operating system. Due to severe validity problems with the Windows8 real time clock (“RTC”), benchmarks results achieved with Windows8 cannot be trusted. The main problem lies with the RTC being affected when over- or underclocking under the operating system. The operating system uses the RTC as reference clock, and benchmarks use it to reference (benchmark) time.
    Source

    If your benching on Windows 8, you should stop right now, your benches won't be valid

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    Re: [AMDocn] Windows 8 Benchmark Records No Longer Accepted At HWBOT / RTC clock bug

    I don't get it. I thought all motherboards had a crystal RTC.

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    Re: [AMDocn] Windows 8 Benchmark Records No Longer Accepted At HWBOT / RTC clock bug

    Quote Originally Posted by kalniel View Post
    I don't get it. I thought all motherboards had a crystal RTC.
    Not sure :/ Never heard of a "Crystal RTC" until now

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    Senior Member kalniel's Avatar
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    Re: [AMDocn] Windows 8 Benchmark Records No Longer Accepted At HWBOT / RTC clock bug

    Quote Originally Posted by Atomfix View Post
    Not sure :/ Never heard of a "Crystal RTC" until now
    It's the standard way of keeping a reference time signal - you have a bit of quartz or whatever crystal that you apply a voltage to (powered by the CMOS battery when computer is off) - it will only vibrate at a fixed frequency, so gives you a time reference. The other source that's used in AC devices is the frequency of AC itself, but PCs are DC devices so don't use that. If you don't have an accurate RTC then you couldn't even play back music properly.

    edit: or maybe it's not actually standard these days :/ Thought it was part of Intel southbridges for most chipsets.

    edit2: It is.
    Quote Originally Posted by http://www.intel.com/content/www/us/en/chipsets/ich-family-real-time-clock-accuracy-considerations-note.html
    App Note: Intel® ICH Family Real Time Clock Under Test Conditions

    Background: External Real Time Clock (RTC) Circuit

    Intel® chipsets using an Intel® I/O Controller Hub (ICH) family component use a crystal circuit to generate a low-swing 32 kHz input sine wave. This input is amplified and driven back to the crystal circuit via the RTCX2 signal. Internal to the ICHn (any member of the ICH family), the RTCX1 signal is amplified to drive internal logic as well as generate a free running full swing clock output for system use. This output pin of the ICHn is called SUSCLK.

    The crystal network employs R1, C1, and C2 to generate the 32.768 kHz sine wave. Actual values for these components are dependent on the crystal component specification, trace lengths on the motherboard, and the crystal’s load capacitance.
    pdf: http://www.intel.com/content/dam/doc...tions-note.pdf
    Last edited by kalniel; 19-08-2013 at 08:57 AM.

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