http://imgur.com/kX6UZpD

( I dont know how to properly insert images :/ )

Seems to work here, from 58 to 63 on 2x gtx 580 8GB. I used claymore v9.7 to set frequencies, as the 9.8 wouldn't allow me to go further than 2100 mhz (otherwise it will drop from, in instance, 2200 to 1000 every second).
Undervolt seems to work too with v9.7, even though from the kill-a-watt it seems its pulling more watts than what is shown on gpuz. Using AB to set the fan to a fixed 55%as v9.7 doesnt handle fan and temperature readings well with this driver