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Author Topic: cant underclock under 900MHz Memory on ASUS EAH6870  (Read 1203 times)
Amaretto
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July 14, 2011, 05:39:46 PM
 #1

Hey guys,

i dont get it.

There are so many posts where i read that you can underclock a 6870 to 300MHz Memory Clock to get the Temps down.

Everytime i do this with MSI Afterburner it pops back up to 1050 MHz.

He accepts everything till a downclock to 900 MHz everything under that will dont take any effect.

Is there anything that i have to change in the MSI Afterburner tool or is it simply not possible with the ASUS card?


Thanks in advance
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heliosxx
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July 14, 2011, 08:12:32 PM
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I have the same problem on HIS 6870. It seems to be locked to the gpu speed in some fashion as changing that changes the lowest minimum memory speed.
deepceleron
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July 14, 2011, 08:22:34 PM
 #3

You might try this, it allows you to change the minimum and maximum that ati overdrive can set the card to:

http://www.techimo.com/forum/graphics-cards-displays/256789-enable-higher-overclocks-ccc-reg-entry.html

heliosxx
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July 14, 2011, 10:12:41 PM
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I found the solution,
edit the msiafterburner.cfg file and replace the two lines:
UnofficialOverclockingEULA   = I confirm that I am aware of unofficial overclocking limitations and fully understand that MSI will not provide me any support on it
UnofficialOverclockingMode   = 2

Amaretto
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July 15, 2011, 10:53:56 AM
 #5

oh nice,

will try this now.

thank you!
ShadesOfMarble
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July 15, 2011, 02:52:30 PM
 #6

I found the solution,
edit the msiafterburner.cfg file and replace the two lines:
UnofficialOverclockingEULA   = I confirm that I am aware of unofficial overclocking limitations and fully understand that MSI will not provide me any support on it
UnofficialOverclockingMode   = 2


Isn't this mainly for OVERclocking the card beyond "safe limits"? Why should UNDERclocking be limitted?

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heliosxx
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July 15, 2011, 03:07:46 PM
 #7

You'd think so, but for me it stopped the exact behavior described here with the memory speed. I was able to underclock (and have it stick) to 575, then after restarting the app, down to 300.
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July 16, 2011, 09:33:24 PM
 #8

I also under clock to 300 or 330 keeps the cards temperatures down from the default limit.
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