Quick Questions

Alright, I'm not that big of a computer guru and have a bit of questions. My graphic card isn't the best in the world, Nvidia GForce 4 FX 5200 and the thing runs ok. I just read that you can overclock it to get better results, now I was wondering:
1.how you would do that
2.how far I can go before i need to buy a cooling system

1. - http://oc3dmark.octeams.com/tip02.html

2. - Depends on how far you overclock it. The most I've been able to overclock my GeForce4 Ti 4600 and still be stable is 15mhz over the core speed and 15mhz more than the RAM speed. Anything higher and it starts to act weird. If I want to overclock more, I need better cooling.

Thanks alot!