The nice thing about buying a retail Intel Core 2 Duo processor from the computer store is that it comes with a heatsink guaranteed to work. It may not be the coolest running heatsink out there, but at least Intel have ensured it runs quietly, maintains the appropriate thermal range for the CPU, and installs without much fuss or any danger to the CPU or motherboard. The Intel RCBFH design is engineered to be cheap to produce, easy to install, and thermally efficient. This is the stock Core 2 Duo heatsink, and it is generally speaking a well designed mass-produced cooler.
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