Install CPU

The next step to building your own computer is to install the processor, or CPU (Central Processing Unit). This step isn't very complicated, but you must take care as incorrect installation could result in permanent damage to the processor.

As usual when handling sensitive electronic components, be sure to ground yourself by touching the plugged-in power supply or some other grounded metal object to avoid causing damage.

There are two types of CPU installation: Socket or slot. The slot style is easier to install since the heatsink and fan should already be built into the protective casing. In this case, all that is required is to lift the guiding rails and insert the CPU into the slot. You don't even have to worry about installing it the wrong way (as long as you don't use excessive force) since the slot is constructed so that the CPU can only be inserted in the proper orientation. In case your heatsink and fan are not already attached to the CPU, it should be a simple matter to snap it on before inserting the CPU into the slot.

The other type of CPU installation is the socket style. This one is currently more popular with manufacturers since it allows better performance. To install a socket CPU, first lift the bar next to the socket on the motherboard all the way up (consult the motherboard manual if you don't know what the CPU socket looks like), then drop the CPU into place. If you have the CPU in the correct orientation, the ZIF (Zero Insertion Force) socket will require just that: zero insertion force, so never apply force when installing these CPUs. If the CPU doesn't drop into place, you have it in the wrong orientation; either look at the socket and CPU to find where Pin 1 is marked and lign them up, or just try the four different orientations, moving the CPU slightly until it simply drops into the socket. Once the CPU is in the socket, press the handle back down until it clips into place. Now you must install the heatsink and cooling fan, which are usually sold in a single piece, but if not you must screw the cooling fan to the top of the heatsink, which should be very straightforward. On the bottom of the heatsink you should see a thermal pad that makes contact with the top of the CPU; if you don't see a thermal pad then you will need to apply a thin layer of thermal paste to ensure the CPU has direct contact with the heatsink. The heatsink attaches to the CPU socket using a metal clip; you should be able to see how it attaches by examining the clip and the corresponding tabs on the side of the socket. Clipping the heatsink to the socket often requires a fair amount of force and you might need to use a slot head screwdriver in order to apply the proper leverage. Once the heatsink and fan are in place, attache the fan's power cord to the appropriate pins on the motherboard; often the spot will be labelled "CPU Fan", but consult your motherboard's manual if you can't find it.

You are now finished installing your CPU and may proceed to the next step, "Installing Memory".