On the other hand, buying a prebuilt machine offers the peace of mind that comes with a warranty and support from the manufacturer. If there's a problem, you know where to turn. Some manufacturers, including Lenovo, offer the ability to customize certain models in their gaming machine lines with component upgrades that may provide an improved experience.
In many cases, buying a prebuilt machine may actually be less expensive than building your own. Because they're building thousands of machines, manufacturers have the ability to buy components in bulk, resulting in an overall less expensive final product. In addition, when building your own computer, it can be easy to overlook some components when creating your budget. An off-the-shelf model will come preloaded with an operating system, for example, while you'll have to purchase a copy when building your own. That alone can add 100 $ to the cost of your system.
And lastly, the machines a company such as Lenovo offers aren't just random compilations of components. In fact, companies spend a great deal of time and effort into designing a product that offers the best value for the money.