Card(s): SAPPHIRE Vapor-X 100352VXSR Radeon HD 7950 3GB
Algo / Coin: Scrypt / LTC
Miner: Cgminer 2.11.4
Script/Config:
export DISPLAY=:0
export GPU_MAX_ALLOC_PERCENT=100
export GPU_USE_SYNC_OBJECTS=1
export GPU_MAX_HEAP_SIZE=100
cgminer -I 19 -c easy1.conf
easy1.conf:
{
"gpu-engine" : "1050",
"gpu-memclock" : "1500",
"thread_concurrency" : "22336",
"vectors" : "1",
"worksize" : "256",
"lookup-gap" : "2",
"temp-target" : "70",
"auto-fan" : true,
"scrypt" : true
}

Results: 618,618,615 Kh/s
Comments: Ubuntu 12.10 using Catalyst 13.1 - comes with APP SDK2.8, ADL SDK 5.0.
Machine is headless, I use ssh or x11vnc to connect. Cards are in a milk-crate case, so heat is not a problem - fans run at about 50%. Haven't fully tweaked things - at least one card crashed at gpu-memclock 1500. Currently trying to figure out under-volting. System power consumption with dual-core FM2 athlon, ssd, is 750W