Yeah, but a couple of 120mm case fans and a good CPU heatsink should do the trick.Put a 100 Watts lighting bulb in a PC case for a couple of hour! The air in the case will get very hot, unless you install big fans!
The last time that I checked (which was with a Northwood C) you're wrong. Intel's boxed processor warranty allows you to use other heatsinks and thermal interface materials and remain in warranty. (Overclocking is a completely different matter of course.)Bear in mind that if you dont use intels hsf and thermal pad then you void your warrenty.