i'm running 12 x 6990 at the absolute edge in overclocking mode (power, temp) - they are all running at 100% 24/7 - unfortunately i have to clock down if the ambient temp is rising, but i use a script for that - a few pic:
http://imgur.com/a/usqDLWould you care to share your script(s) or how you show temperatures and the last picture where it shows V (is that volts?)?
