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Tests with powerplay states

Discussion in 'RBE' started by mksu, Mar 24, 2010.

  1. mksu New Member

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    Hello to everyone I'm new to this forum!

    I found here this great RBE tutorial which was very helpful to me. Just the Powerplay settings with their linked ten clock infos remained unclear to me. It was not really obvious under which conditions which powerplay state is applied in connection with low, medium and high mode. So I flashed a Bios on my HD 3870 with "color marked" clocks, which means that i use ten different clock settings with wide spreads between them. Afterwards I ran Windows with several applications and monitored the GPU clock with the Rivatuner in order to determine the applicated power states and the related modes.

    My HD 3870 is equipped with the following states:
    State 0 - Boot
    State 1 - Power savings for notebooks, high performance, optimal performance, overdrive template
    State 2 - Power savings for notebooks, high performance, optimal performance
    State 3 - UVD

    Now to the results:
    • In idle mode (desktop, office, firefox) the card is running in State 2 in low mode. It does not make any difference if Aero is activated or not (I use Win 7 64 bit as OS).
    • Sometimes there are short leaps in idle to medium mode, but they last only for one two seconds, are not reproduceable and do not depend on GPU load.
    • In 3D applications like games (Bad Company 2, TW 08) or Furmark the card remains in State 2, switching to high mode.
    • State 3 is activated when replaying HD videos, immediately applying high mode, just switching temporarily into low mode when winding back or forward.
    • When replaying Youtube videos or other non HD video sources (especially TV series episodes sized appr. 370 MB), the card remains in State 2 low mode.
    • Whether the checkbox "enable Ati Overdrive" in the CCC is activated or not, the card remains in State 2. If the card is being overclocked by CCC, the clock set in CCC is applied instead of high mode in State 2.
    • I was not able to shift the card onto State 1. The only evidence of State 1 is that its medium mode is the new lower bound of GPU clock in the CCC Overdrive tool.
    So it would be very interesting to find out what this overdrive template is, which is the difference between State 1 and 2, and under which conditions it is applied. Additionally I would like to know under which conditions the medium modes are applied. The hitherto expressed assumption is that it consists with Windows Aero, but I didn't find any clue for it as enabling and disabling Aero doesn't make any difference. So I look forward to here your ideas!
    Last edited: Mar 24, 2010
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  2. DRDNA

    DRDNA

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    mksu Welcome to TPU !

    I would be interseted in knowing this info too...I will be following the thread.:toast:
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  3. W1zzard

    W1zzard Administrator Staff Member

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    very nice writeup, good work.

    the low / medium / high switching basically counts how many clock cycles in a given interval the gpu is idle and then picks an appropriate profile
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  4. mkchiu New Member

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    I've never seen the "over drive" or "state 1" on the 5770 Hawk I'm currently testing. There is only UVD and a three-frequency stair as you have. That's regardless of changing the Windows Power Scheme, ATI/CCC Over Drive, or gaming.

    I'd hope it's extra option or a BIOS option for laptops only. Since just the low to medium clock frequencies within "state 2" seem to glitch frequently and cause visible distortions, e.g. 157 to 600 to 157 on both 5770s I've looked at.
  5. mksu New Member

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    But why should they implement a Bios option only für notebooks into a desktop graphic crad? Albeit the low mode in State 1 and 2 is referred as "power savings for notebokks", it is applied ont he desktop Pc, too.
  6. mkchiu New Member

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    The nomenclature has not kept up with the usage of dynamic states.

    Referring to power savings or notebooks mode is not unusual. Intel SpeedStep began as a way to control notebook power and temperature. Modern desktop CPU and GPUs have some degree of power savings from dynamic frequency or dynamic voltage controls which began on laptops. Also it's difficult to change entrenched naming conventions.
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