I am able to get 850MHz core, 300 MHz memory stable using the stock 1.088V. However, I wouldn't mind increasing the core voltage slightly to increase my clock speed.
I am running Ubuntu 11.04. I am using Catalyst 11.6 with SDK 2.1. However, nothing I do allows me to increase my voltage. According to this page, Trixx should allow overvolting, so the card should be compatible: http://www.sapphireselectclub.com/ssc/TriXX/TriXX.aspx
I can increase the voltage using pyADL. However setVoltage(2,1088) returns false (for anything over 1088). aticonfig is then unable to set clocks:
btc@DJB-BTC1:~$ aticonfig --od-setclocks=900,300 --adapter=1
ERROR - Set clocks failed for Adapter 1 - ATI Radeon HD 5800 Series
Please check that input values were valid
If I lower the voltage to 1088 or below, this command works great. So basically, if the voltage is over 1088, the frequencies cannot be set.
I have also tried AMDOverdriveCTRL.
Does anybody have any ideas?