DISPLAY=:0 aticonfig --od-enable
DISPLAY=:0.1 aticonfig --od-enable
DISPLAY=:0 aticonfig --od-setclocks=1000,300 --adapter=0
DISPLAY=:0.1 aticonfig --od-setclocks=1000,300 --adapter=1
DISPLAY=:0 aticonfig --pplib-cmd "set fanspeed 0 80"
DISPLAY=:0.1 aticonfig --pplib-cmd "set fanspeed 0 80"
aticonfig --odcc --adapter=all
Is this how you're trying to overclock them?
See what LinuxCoin is using. Whatever version of drivers/software they're using allows one to bypass the limits without changing the firmware.
https://bitcointalk.org/index.php?topic=7374.0Lowering the memory clock will decrease the temperature significantly.