This will be the very first PC I have ever built from scratch. I've been doing some research and noticed that in one book a dab of thermal grease was placed just under the CPU. I will be using a 7 fan mod case (four intakes) with no overclocking, and Intel 875 motherboard, and probably a 3.0 Ghz Pentium. Is the thermal grease technique neccessary? If so, does the retail package for the Pentium chip provide grease? Thanks for the info.