If you are looking into building a new system for yourself socket 939 a great choice. It offers serious performance advantages over last generation's socket A and 478 while being more affordable than most 775 setups. If you are upgrading the 939 platform even allows you to use your old memory, instead of having to buy DDR2. You will need a processor, motherboard, and PCI Express video card to make the move to 939. It is also worth investing in a a new power supply and an aftermarket CPU cooler, but you technically do not have to. In this guide we are going to put together three systems, each at a different price level. These are not systems we have built up so there will be no testing or anything like that, but it will give readers a good idea of current prices and some new products.