There are times when a computer starts to slow down and parts need replacing. In a desktop, the process is as simple as opening up the case and switching the parts out. However, in a laptop the process is much more complicated. If upgrading the RAM is not good enough, it is possible to upgrade the CPU. This is not easy, so it may be worth considering alternatives instead.
Surface vs. Socket
In laptops, CPUs are mounted to the motherboard in two ways. One method is through surface mounting. In this case, the CPU is directly soldered onto the motherboard. Although it might be possible to desolder the CPU and solder a new one on, there is no guarantee that the CPU will work correctly. The other method is through socket mounting. With socket mounting, the CPU is placed on the motherboard's socket, then either screwed in place or locked into place with a small bar. With socket mounting, it is possible to change the CPU without worry of soldering, as long as the CPU is compatible.
Compatibility
A CPU and motherboard are tied together in compatibilty. The CPU must match the motherboard's socket and front side bus specifications. Before upgrading a laptop CPU, consult the laptop user manual for specifications. It may be that the CPU already being used is the maximum allowable for the motherboard, and therefore an upgrade cannot be done. Although in a desktop, this situation would call for replacing the motherboard as well, in a laptop this is much more difficult because the motherboard needs to fit into the casing as well as be compatible with everything else in the laptop. Users should update the BIOS as well because a new BIOS may give the motherboard expanded capabilities.
Disassembly
If a new CPU is compatible and socket mounted, it may be OK to go ahead with the upgrade. Accessing the CPU is not easy, however, and may require elaborate disassembly of the laptop. Before starting, unplug the laptop and remove the battery to avoid shock to the user and the laptop. Also remove the hard drive to protect data, as well as the RAM.
Most often, the process involves accessing and unhooking the display first. This may involve removing plastic coverings that hide screws. Next remove the keyboard and the upper casing to reveal the inside of the laptop. Remove video cards and heat sinks as necessary to access the CPU.
CPU Exchange
Either unscrew or unlock the CPU, then place the new CPU onto the motherboard. Many CPUs have small arrows to indicate how they should sit in the motherboard. Trying to force the CPU into place may damage the CPU, so if it does not fit, it may not be seated correctly. Once the CPU is in, place a small amount of thermal paste on top of it and place the heatsink on top.
Considerations
The time and money it takes to replace a CPU may not be worth the trouble, but that is up to the laptop owner to determine. If the user is inexperienced in changing the parts of the computer or the general construction of the laptop, he can cause damage to the laptop, making some or all of it not work properly.
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