Overclocking...should I?

Ok, bear with me.....
How much should I "try" to OC a 8500GT....
Should I raise the fan speed as well?
I have one aux fan blowing on it too...
3.6Ghz P4
4 Gb RAM
Win XP
How much should I "try" to OC a 8500GT....
Should I raise the fan speed as well?
I have one aux fan blowing on it too...
3.6Ghz P4
4 Gb RAM
Win XP