Hi all,
I'm pretty new to bitcoins and my main focus is on mining! I'm not really out to make cash or anything I just like to tinker with computers, and mining looks like a fun way to do it

I'm currently mining on a single 5850 which I set up over the weekend (and have made 0.25 BTC so far, w00t). I overclokced it a bit and managed to get 310 MHash/sec pretty easily. From my brief readings it looks like significant performace gains can be got from underclocking your GPU. Not really sure why this is but hopefully some of you guys can help me out with that.
cheers
JP
If you under clock your video RAM you'll see improvements using a worksize of 256 in my experience.
My settings:
GPU: 1065 MHz
RAM: 300 MHz
VCC: 1.11
phoenix.py -k phatk VECTORS BFI_INT FASTLOOP=false AGGRESSION=12 WORKSIZE=256
Yeilds me 235 Mh/s on a Radeon HD 5770