The processor can be an important consideration for users who are building a computer. Today, there are three main processor manufacturers: AMD, Cyrix, and Intel. Each of these companies have good and bad reviews, and really each of them are very close in compatibility and reliability. When considering any of these processors verify the motherboard is compatible. For example, if an Intel motherboard is purchased or currently installed into the computer, purchase an Intel Processor, an AMD processor only works on a motherboard designed for AMD.