It all began when Dell, previously retailing only Intel boxes, started to offer AMD's Opteron processors in its server lineup. Today, the Round Rock, Texas, manufacturer announced that it is expanding its relationship with the California chip maker by putting AMD processors in the Dimension desktop series. According to Dell, the first AMD-based systems are slated to retail in September. Coincidentally, the first Intel-based Core 2 Duo PCs are expected to hit in stores during the same time frame.