Now that the CPU is installed in the motherboard, you need to install the heat sink and fan. Although you can perform this step before installing the chip, by doing that you risk damage to the pins on the chip.
The following procedure is for a Socket 7 processor. On a Pentium II processor, the fan is attached before CPU installation. Simply lock the fan into the small holes on the metal side of the processor.
Well, I'll get right to it.
1.)
Attach the fan to the heat sink. This step is often already done for you, but if not, you must do it yourself. This is done using the four screws that came with the CPU fan.
2.)
Apply the Heat Sink Compound. Most setups use heat sink compound. Apply just enough to cover the surface of the chip. If you have portions of the chip higher than others, apply compound only to the raised areas. The layer should be thin. More won't hurt anything, but will be a mess when you press the heat sink down. On some setups, you can skip heat sink compound. Instead, some clips hold the heat sink down. While, in some cases you can skip heat sink compound, keep in mind that even this setup can benefit from the increased contact provided by heat sink compound. More on this next step.
3.)
Attach The Heat Sink. Place the heat sink squarely on top of the processor, pressing down lightly. Most newer heat sinks use a set of clips on each side to fasten itself down. These clips attach to a pair of tabs on each side of the socket. It will probably take a little bit of force to bend the clip down over the tab. Other heat sinks wrap around the processor, then just sit on top, the compound being the only real attachment.
4.)
Double-Check Contact. You need to make sure all areas of the chip are in contact with the heat sink. The best way to do this is to temporarily remove the heat sink again and see if there are any areas of compound that remain smooth because it didn't touch the chip. Apply a little more compound to any such areas, then refasten the heat sink. Repeat this until all areas are in contact with the processor.
5.)
Clean The Mess. If you applied too much compound, some will have oozed out the sides. Wipe this up. After that, you're done.
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