Well first of all, running ClockGen or other software won't add any excess heat, because you can't adjust voltage. The voltage is what adds the extra heat.
Also, good luck getting it stable with one of those programs. If stock FSB is 200, you'll be LUCKY to be able to hit 220 stable. The reason why is because it also overclocks your PCI bus, PCIe bus, RAM, EVERYTHING. That's bad. Us overclockers will lock all of those other buses and limit our RAM down, to achieve a higher CPU speed.
Good luck, that's all I've got to say. I've personally managed it with ONE computer successfully (Celeron D 3.2GHz @ 4.5GHz). But it took DDR500 (@ DDR466, stock slots were 400), and NO PCI cards in the slots to achieve it, and all my onboard stuff disabled.
Even my sig rig, if I limit my RAM, lock my PCI and PCIe buses, Clockgen just freezes it up past 230MHz FSB.
Also, if you push it too far with Clockgen, be prepared for a permafried Operating System. I know, I've been there and done that.
My advice, leave it alone and consider it a lesson learned. Next time, build your computer. OEM's are NOT meant for overclocking. PERIOD.
The Computer was dirt cheap so im not really concerned about it. I can always buy a new MB in the future if i need it.