I'm also fighting with 5970, those GPU are not easy... Can you tell me which Catalyst and AMD-APP-SDK versions are you using and which cgminer options?
For reduce the VCC you only need to add the next option to the cgminer.conf file
"gpu-vddc": "0.95"
But in my tests less than 0.97 gives very low hashrate... however maybe I messed it up in some other point.
I am using 13.1 and 2.7 sdk.
Yes i have added that option in bat file not in conf file.
Hello guys i have a miner consisting of XFX
1.6990 black edition
2.5970 black edition
Which is running @ 1.732 Mhash/sec.
6990 @910/1360/1.110v 491hash per core
5970 @820/1200/1.050v 373hash per core
I want to bring 5970 lower on 0.95v. Please tell me cgminer settings which will provide me max Mhash/J. Do tell me intensity TC g, work, etc etc.
1.05~1.10 is the lowest you can probably go and still get decent hash rates. Otherwise, running lower, you'll lose a good amount of hash rate.
You probably can go 850 mhz core on the 5970. Maybe 950 core on the 6990.
TC=8192, g=2, Worksize=256, I=18.
I want 650+khash on 0.95v
5970 @ 715 0.95v and 765 have helped me to reach 590. Testing TC now
700~725 khs on 0.95 is about the average at that voltage.