Bitcoin Forum
February 28, 2017, 05:55:37 AM *
News: Latest stable version of Bitcoin Core: 0.13.2  [Torrent]. (New!)
 
   Home   Help Search Donate Login Register  
Pages: [1]
  Print  
Author Topic: Adjusting voltage with aticonfig for Sapphire 5850 Xtreme works, but!  (Read 4426 times)
BenD
Newbie
*
Offline Offline

Activity: 19



View Profile
July 09, 2011, 12:12:33 AM
 #1

Hi @ all.

I just noticed that adjusting the voltage of a Sapphire 5850 Xtreme seems to work correctly with aticonfig. This is what Windows-users without crossfire-bridge dream of.
How I noticed? I use a saved overdrive-profile
Code:
<?xml version="1.0" encoding="utf-8"?>
<OVERDRIVE_PROFILE>
  <PERFORMANCE_LEVEL level="2" gpu="95000" mem="30000" voltage="1088"/>
  <PERFORMANCE_LEVEL level="1" gpu="55000" mem="90000" voltage="1038"/>
  <PERFORMANCE_LEVEL level="0" gpu="15700" mem="30000" voltage="950"/>
  <FAN_SETTING percentage="75"/>
  <FAN_CTRL enabled="no"/>
  <FAN_CTRL_CURVE type="0"/>
  <FAN_CTRL_POINT nr="0" temperature="2000" percentage="0"/>
  <FAN_CTRL_POINT nr="1" temperature="4000" percentage="2500"/>
  <FAN_CTRL_POINT nr="2" temperature="6000" percentage="5000"/>
  <FAN_CTRL_POINT nr="3" temperature="8000" percentage="7500"/>
  <FAN_CTRL_POINT nr="4" temperature="10000" percentage="10000"/>
  <MONITOR_SAMPLE_TIME interval="10"/>
  <COLOR_PROFILE enabled="no" longitude="-13,500000" latitude="52,500000" color_temp_day="6500" color_temp_night="4000" transition="30"/>
  <POWERTUNE percentage="0"/>
</OVERDRIVE_PROFILE>
and played with gpu and mem, because I don't like the GUI. The standard voltage in Performance Level 2 is 1088 (=1.088 V). When I have it like this, while mining, the rig will consume 454 W/h. With these settings, the 1st card gets 75.5 °C, the 2nd card gets 78°C.
Even the slightest change of the voltage, e.g. to 1094 will cause a heavy increase of consumed power: 515 W/h! Card temperatures rise to 78.5 °C and 83 °C.

Maybe someone is interested how this profile is executed. Save the profile as overdrive_settings.ovdr (or else). Create a bash-script named overdrive.sh and put in
Code:
#!/bin/bash
export DISPLAY=:0.0
aticonfig --od-enable
AMDOverdriveCtrl -b -i 0 overdrive_settings.ovdr
AMDOverdriveCtrl -b -i 3 overdrive_settings.ovdr
And run a chmod +x overdrive.sh - voilá. This is not new, found it somewhere in the forum. Interface numbers may vary for you - to check, run export DISPLAY=:0.0 (or what is right for you) and AMDOverdriveCtrl. It will show you which adapters are active.

But I think this is the proof, that voltage adjust works in linux. However increasing consumed watts and heat a lot.

Btw. I am using Linuxcoin 0.2a at this time with smartcoin r370. Combined hashrate with the settings above is between 815 and 940 MHash/s. Average is 860 MHash/s. Just noticed this is wrong. Smartcoin added 2 miners per GPU, the hanging calculation stretched the measured time and so it showed more than it actually hashed at. Configured it correctly now, getting 782,5 MHash/s. Not fluctuating this much anymore. This is still very good at these clockings and stock voltage. Compare the Table.

Good luck.
Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.
Jack of Diamonds
Sr. Member
****
Offline Offline

Activity: 252



View Profile
July 09, 2011, 12:19:16 AM
 #2

Quote
while mining, the rig will consume 454 W/h. With these settings, the 1st card gets 75.5 °C, the 2nd card gets 78°C.
Even the slightest change of the voltage, e.g. to 1094 will cause a heavy increase of consumed power: 515 W/h!
Voltage adjustments upwards increase energy consumption in an exponential scale.

I'm trying to tell this to people volting their cards to 1.2v (your power consumption will go up about 150-200 watts & you will gain maybe 30 mhash more) but nobody seems to care or they get 'free' energy.

1f3gHNoBodYw1LLs3ndY0UanYB1tC0lnsBec4USeYoU9AREaCH34PBeGgAR67fx
Pages: [1]
  Print  
 
Jump to:  

Sponsored by , a Bitcoin-accepting VPN.
Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2006-2009, Simple Machines Valid XHTML 1.0! Valid CSS!