Latest posts of: melanarchy

So thanks to this guide I got my 6870 set up with Natty. My box is headless (2 wires plugged in, power and ethernet) so this is the perfect guide for me.

A few things I've done.
1) Get AMDOverdriveCtrl - although this is a GUI app, you can run a batch job that will let you override the minimum memory clock and allow you to underclock your memory (I haven't yet figured out a config that allows you to override the maximum gpu clock).
Here is the config for lower memory


<OVERDRIVE_PROFILE>
  <PERFORMANCE_LEVEL level="2" gpu="100000" mem="30000" voltage="1088"/>
  <PERFORMANCE_LEVEL level="1" gpu="55000" mem="30000" voltage="1038"/>
  <PERFORMANCE_LEVEL level="0" gpu="15700" mem="30000" voltage="1000"/>
  <FAN_SETTING percentage="55"/>
  <FAN_CTRL enabled="yes"/>
</OVERDRIVE_PROFILE>

Save that to a file and then run AMDOverdriveCtrl -b filename

Now using aticonfig --odgc you should see a lower memory limit. You can then do sudo aticonfig --adapter=0 --od-setclocks=1000,400 (or whatever you want) to under clock the memory.

My 6870's max stock overclock is 1000 and i haven't figured out how to get AMDOverdriveCtrl to accept a config that goes above that yet. Once you've found what works for you don't forget to save the clocks onto your gpu so they persist through reboots with aticonfig --odcc --adapter=all.

2) Use the phatk kernel (actually I noticed the guide specifies this, I just missed it the first round through)
I've also found that with the version of the SDK outlined here the phatk kernel is better than poclbm with this execution line I get 299+ Mhash/sec out of my 6870:
./phoenix.py -u http://XXXXX -k phatk DEVICE=0 BFI_INT VECTORS FASTLOOP=false AGGRESSION=12 WORKSIZE=128 PLATFORM=0

I don't use the autostart scripts, mainly because I've been futzing with values, but I launch a screen and keep phoenix open in it, and a script to look at gpu temp/current balance in another virtual window.

I'm happy to answer questions about this if people need help.

_{1aLV7cjRXE89KoychBaGUP8YGm5ZRVNAw - If my info is helpful donations are always welcome.}