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Author Topic: Help Downgrade Mhz Mem in ubuntu  (Read 1455 times)
Christian Pezza
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August 14, 2011, 08:24:55 PM
 #1

Hello

Nob in linux I need someone help me to understand how to downgrade speed of memeory for a XFX 6970/6950/6870/6850

I found many people doing it on Win and I dont understand how to make it happen in linux

I am mining with poclbm

if there is any helpfoul links please let me know

Thank you in advance

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Christian Pezza
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August 14, 2011, 10:10:30 PM
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bump

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BTC_Junkie
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August 15, 2011, 12:40:38 PM
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Its a huge pain in the ass. You'll need to edit the BIOS.  From a post that I used as a guide:

Use windows (go to a library/net cafe if you don't use it...) to:
Download and run Radeon Bios Editor (no install necessary) and edit the necessary settings. There is an amazing FAQ on the techpowerup website.
And then boot into a windows 98 dos OS on USB and burn the newly created BIOS to your card using atiflash -p 0 bios.rom where 0 is the device number and bios.rom is the BIOS file (can be named whatever you want, like b.
It's a shame but it seems most linux programmers don't want to touch the proprietary ati code with a 10 foot pole. This will probably be true for some time.

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August 15, 2011, 02:25:40 PM
 #4

You do NOT need to edit the BIOS. Since version 11.6 of the Catalyst driver, you can overclock (and underclock) the cards to whatever you want in Linux. So install 11.6 and use something like AMDOverdriveCtrl or similar.
Christian Pezza
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August 15, 2011, 05:35:32 PM
 #5

You do NOT need to edit the BIOS. Since version 11.6 of the Catalyst driver, you can overclock (and underclock) the cards to whatever you want in Linux. So install 11.6 and use something like AMDOverdriveCtrl or similar.

thank you for replying guys!

do u have any example how to write a command to underclok it in Ubuntu? My understanding there is no GUI on AMDOverdriveCtrl in Ubuntu I saw it only on Debian!

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August 15, 2011, 11:57:26 PM
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https://bitcointalk.org/index.php?topic=17585.0
BTC_Junkie
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August 16, 2011, 12:08:26 AM
 #7

Make sure to verify that the mem clock was actually lowered... until i flashed the bios it would accept the lower clock, but when I checked the actual value with aticonfig it would be around 1300 still.

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Christian Pezza
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August 16, 2011, 04:14:29 AM
 #8


love it thanks Cheesy

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August 16, 2011, 06:04:59 AM
 #9

thank you for replying guys!

do u have any example how to write a command to underclok it in Ubuntu? My understanding there is no GUI on AMDOverdriveCtrl in Ubuntu I saw it only on Debian!

Im running Ubuntu 11.04 and can use AMDOverdriveCtrl both with GUI and without GUI.
Christian Pezza
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August 16, 2011, 07:26:31 AM
 #10

thank you for replying guys!

do u have any example how to write a command to underclok it in Ubuntu? My understanding there is no GUI on AMDOverdriveCtrl in Ubuntu I saw it only on Debian!

Im running Ubuntu 11.04 and can use AMDOverdriveCtrl both with GUI and without GUI.

perfect! now my question is:
how can I run  AMDOverdriveCtrl  to set up 4 cards in the case of xfx 6870 oc core underclock mem? suggestions are welcome  Tongue
I rather work without GUI I like it raw Cheesy

I saw in the in wiki mining hardware comparison some dude with a 6870 going to core 1038 and mem 360 when the core cant go more then 1000 if I am using AMDOverdriveCtrl with GUI

with the 6970 I got from 330 to 415 Cheesy but using AMDOverdriveCtrl with GUI only for one card of three

I wish there is more documentation with oc and underclock reference as model, brand and mother board.

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hugolp
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August 16, 2011, 07:40:43 AM
 #11

perfect! now my question is:
how can I run  AMDOverdriveCtrl  to set up 4 cards in the case of xfx 6870 oc core underclock mem? suggestions are welcome  Tongue
I rather work without GUI I like it raw Cheesy

I saw in the in wiki mining hardware comparison some dude with a 6870 going to core 1038 and mem 360 when the core cant go more then 1000 if I am using AMDOverdriveCtrl with GUI

with the 6970 I got from 330 to 415 Cheesy but using AMDOverdriveCtrl with GUI only for one card of three

I wish there is more documentation with oc and underclock reference as model, brand and mother board.

To select a different card: AMDOverdriveCtrl -i X (where X is the number of the device you want to adjust). Its all explained in the AMDOverdriveCtrl docs.
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