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Author Topic: 5850 Linux Overclock more than 775Mhz without modified BIOS  (Read 1492 times)
sanchaz
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June 17, 2011, 12:06:08 AM
 #1

So is it possible to overclock a 5850 in linux more than 775Mhz without modifying the BIOS?

EDIT:
btw why can it be done in windows and not in linux?

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June 17, 2011, 08:24:05 PM
 #2

Hi!
I have the same problem.
I have got a XFX 5850 black edition:

Code:
user@linuxcoin:/media/usb$ aticonfig --adapter=all --odgc
Adapter 0 - ATI Radeon HD 5800 Series
                            Core (MHz)    Memory (MHz)
           Current Clocks :    157           300
             Current Peak :    765           1125
  Configurable Peak Range : [550-775]     [900-1125]
                 GPU load :    0%

Adapter 1 - ATI Radeon HD 5800 Series
                            Core (MHz)    Memory (MHz)
           Current Clocks :    157           300
             Current Peak :    765           1125
  Configurable Peak Range : [550-775]     [900-1125]
                 GPU load :    0%
user@linuxcoin:/media/usb$

I am able to overclock from 765 to 775, or anything within the "Configurable Peak Range".
Whith AMDOverdrive I can change the range to set memory to 300, but I can't configure an higher value than 775 on core.

I have tried to cange the pcie mhz in the bios from 100 to 110, but the card still runs with 775 mhz...
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July 12, 2011, 07:08:59 PM
 #3

Depending on which card it is exactly you should be able to set the clock to 875 on a stock card. I had to load a modified BIOS with 1.088 voltage to be able to run 900-975 stably.

Installing the ATI 11.6 Linux drivers (remove fgrlx packages first before installing) will let you set out of bound clock and memory settings with aticonfig.

export DISPLAY=:0
aticonfig --odsc 875,300 --adapter=all

Ubuntu Desktop x64 -  HD5850 Reference - 400Mh/s w/ cgminer  @ 975C/325M/1.175V - 11.6/2.1 SDK
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