OC'ing 65W 4200+ Brisbane
 

So I have the Brisbane 4200+ 65W and the ZeroTherm NV120. I know I can overclock the crap out of this thing. I'd like to find out if anybody here knows good values. Should I keep stock voltage and just up the clock, or should I step up the voltage, too?

I've heard I can take this thing to 3.06 with stock voltage if I cool well enough. That seems a bit extreme to me, without a peltier, but I'm merely an amateur. Any help is greatly appreciated.

Also, I have a X1950PRO 512MB 256-bit GDDR3. This can be overclocked as well. Recommended? Values?

Thanks, I appreciate the help.