Card(s): Sapphire HD 7950 x 3
Algo / Coin: Scrypt / LTC
Miner: Cgminer 3.1.1
Config: --thread-concurrency 2172 -I 20 --gpu-engine 1050 --gpu-memclock 1400 --gpu-vddc 1.087 --temp-target 80 --auto-fan
Results: 600 kH/s per card - Temp ~76c - 950W @ power socket
Comments: Using Catalyst 13.4, APP SDK 2.7, ADL SDK 5.0, Ubuntu server 12.04

But CGMiner reports my volts are still 1.25V so I doubt undervolting works.