Back in the days of dialup internet, it was commonplace to build your own computer. Instead of walking into a Best Buy or logging onto Dell's website to shop for a complete unit, you'd assemble a desktop PC yourself using standardized, commodity parts purchased either online or at a store specializing in computer components.

These days, most consumers have only ever bought prefab systems, no assembly required. However, many gamers and computer hobbyists still prefer to roll their own boxes. Doing so means you maintain total control over how the computer turns out, and a successful DIY build is a point of pride. Also, knowing your way around the inside of a PC makes it easier to replace a single piece of a broken-down system instead of just junking your whole rig and buying a new one.