This is my modest rig mining LTC:

Card: VTX3D Radeon HD 7970 X-Edition - 3 GB GDDR5
Algo / Coin: Scrypt / LTC
Miner: Cgminer 3.1.0
Config: --thread-concurrency 8192 -I 13 -w 256 -g 2 --gpu-memclock 1500 --gpu-engine 1085 --lookup-gap 2 --gpu-threads 2
Results: ~750 kH/s - Temp ~85 ºC aircooled
Comments: Using Catalyst 13.1, LinuxMint 14