High-end ATI cards (58xx, 5970, 68xx, 69xx)
Non-dedicated (use these settings if you use the computer while mining)
-k poclbm VECTORS BFI_INT AGGRESSION=7
Dedicated miner
-k poclbm VECTORS BFI_INT FASTLOOP=false AGGRESSION=11
-f FRAMES, --frames=FRAMES
will try to bring single kernel execution to 1/frames
seconds, default=30, increase this for less desktop
lag
-a ASKRATE, --askrate=ASKRATE
how many seconds between getwork requests, default 5,
max 10
-w WORKSIZE, --worksize=WORKSIZE
work group size, default is maximum returned by opencl
-v, --vectors use vectors
This thread
https://bitcointalk.org/index.php?topic=65971.0 has a lot of good info too.