Well, if you want to get to 4.1Ghz, you are going to have to get water cooling. It just gets too hot. The FSB is what you change for overclocking. Change the FSB from 533Mhz to 800Mhz and BAM! 4.0Ghz processor.
However, there are a lot of other things to consider with overclocking. You will need to get a good overclockable motherboard, RAM, and a good power supply. You also have to know what you're doing. Don't want to screw something up, and have it cost you a new system.
If you would like to stick with AMD, why not go with an Opteron? They can be overclocked quite well, too.
<br><br><font color=\"black\"><b>There's No Place Like </b></font><font color=\"red\"><b>127.0.0.1</b></font><br>