Hello! My question is quite simple and may sound silly but it's the first time I'm building a system with socket 775 and Neither the MOBO or the processor came with Thermal Grease the guide don't even mention it, so my question is, Should I apply a thermal grease layer on this kind of processor? or it's not necessary, the Heat sink looks like already have some on the bottom but im not sure, any cares and precautions about this kind of processors will be appreciate it, I don't want to fry the system, thank you so much!