01-02-2013, 09:57 AM
5970 cannot safely do 850Mhz without overvolting.
I would recommend flashing your 5970s with an overclocked & overvolted BIOS if you plan to continue overclocking. I use the "Pre OC vbios 800/1100 1.15v VDDC 1.15v VDDCI" found in the first post of this page http://forums.bit-tech.net/showthread.php?t=185918 on all four of my 5970s, and then push the clocks up to 825Mhz with amdconfig. This configuration allows them to run cool and stable on air.
You may also want to consider dropping your memory clocks. The VRM's on the 5xxx series get very hot. If you're doing brute force you can safely drop your memory clocks down to 300Mhz. If you are doing wordlist based attacks, you can set the memory clocks equal to, or slightly higher than, the core clocks. This will help keep your temps low while also ensuring good performance.
I would recommend flashing your 5970s with an overclocked & overvolted BIOS if you plan to continue overclocking. I use the "Pre OC vbios 800/1100 1.15v VDDC 1.15v VDDCI" found in the first post of this page http://forums.bit-tech.net/showthread.php?t=185918 on all four of my 5970s, and then push the clocks up to 825Mhz with amdconfig. This configuration allows them to run cool and stable on air.
You may also want to consider dropping your memory clocks. The VRM's on the 5xxx series get very hot. If you're doing brute force you can safely drop your memory clocks down to 300Mhz. If you are doing wordlist based attacks, you can set the memory clocks equal to, or slightly higher than, the core clocks. This will help keep your temps low while also ensuring good performance.