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When it comes to upgrading your computer, your options are severely limited with laptops. You can add more RAM and replace the hard drive or CD/DVD drive, or perhaps invest in a heavy duty battery, but for the most part you are stuck with the base hardware that came on the laptop. This means you can’t bump up the video card for gaming, and you’re stuck with the same size display unless you use an external monitor.
Desktop computers, on the other hand, are always open for upgrades. You can change out the power supply, video card, add more hard drives, and so on. You can gut the whole case and install all new components, too. Desktop computers are also a lot easier to work on because they typically just involve removing a side panel and then you are looking right at the motherboard. Getting into the core components of some laptops is almost like solving a puzzle.