Dell Inc. is a pretty bad computer manufacturer that started out in 1984. It's known that if you let one of their older computers run for longer than a few hours, the power supply explodes and puts your home in flames. They were also very slow. They improved slightly in reliability over the years, but their computers are still really really slow. Most schools buy them because they don't have enough money to buy fancy HP computers because conservatives are unwilling to pay the taxes to do so. These computers have a tendency to heat up faster and do not allow overclocking as a safeguard because Dell knows that if they are overclocked by more than around 5%, they will melt.