Originally posted by RealNC
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Originally posted by darkbasic View PostWhat about checking the lowest values used by fglrx and override atombios infos for RV670?
Did you try fglrx? Does it report memory clock?
Whatever we decide to do I suggest to wait for PM meeting in AMD. Now we just guess blindly.
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Originally posted by Zajec View PostDid you try fglrx? Does it report memory clock?
I can also boot windows and check the frequencies with some overclock utility.## VGA ##
AMD: X1950XTX, HD3870, HD5870
Intel: GMA45, HD3000 (Core i5 2500K)
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On both Windows and Linux, when Catalyst downclocks my card (HD4870) for "non-3D mode" it only does that for the GPU. The memory clocks stay as they were.
On Windows this can be seen in the "Overdrive" section of the CCC. On Linux you have to use fglrx's command line tool to get the clocks.
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Originally posted by RealNC View PostOn both Windows and Linux, when Catalyst downclocks my card (HD4870) for "non-3D mode" it only does that for the GPU. The memory clocks stay as they were.
On Windows this can be seen in the "Overdrive" section of the CCC. On Linux you have to use fglrx's command line tool to get the clocks.Last edited by monraaf; 20 January 2010, 01:08 PM.
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Originally posted by monraaf View PostAFAIK most of the HD 4xxx cards do not downclock the memory.
My GDDR3-based HD4850 downclocks memory correctly out of the box, which makes a visible difference in power consumption: with fglrx this card consumes around 40-45W on idle in my system (which can fall another 4-5W using a BIOS with reduced 2d memory clocks). With radeonhd (no power management), the same card consumes around 65-70W on idle - ouch!Last edited by BlackStar; 20 January 2010, 01:18 PM.
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Originally posted by BlackStar View PostI don't think that's true. As far as I know, only the GDDR5-based HD4xx0 cards do not downclock memory, because GDDR5 memclock changes require some kind of recalibration that produces a short - but visible - flicker on screen.
As you can see all the HD 4xxx cards in the list have the same idle as load memory clocks.
My GDDR-based HD4850 downclocks memory correctly out of the box, which makes a visible difference in power consumption: with fglrx this card consumes around 40-45W on idle in my system (which can fall another 4-5W using a BIOS with reduced 2d memory clocks). With radeonhd (no power management), the same card consumes around 65-70W on idle - ouch!
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Hmm, strange why your card does it and none of the GDDR3 ones listed in the review. A board difference or a Windows/Linux difference?
For instance, my original 4850 BIOS contained three power states (2d, low 3d, high 3d), with 2d clocked at 750MHz and high 3d clocked at 993MHz (I think low 3d was 750MHz, too, but it's been while and I may be wrong). Later revisions of the card came with 2d at 500MHz, which prompted me to modify the BIOS manually.
I don't think that's a windows/linux difference either, because my power meter gives the same indication on both OSes.
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