Apple Inc on Tuesday is expected to unveil new Mac computers using its own in-house processor chips, a move that could reignite a race to control the market for desktop and laptop chips and benefit players such as Qualcomm Inc . The market has been dominated by Intel Corp and Advanced Micro Devices Inc since 2006, when Apple joined most other major computer makers in using chips based on Intel's 'x86' computing architecture. On Tuesday Apple is expected to start a two-year process of ending its nearly 15-year relationship with Intel by introducing Mac computers with Apple-designed chips based on computing architecture technology from Arm Ltd, which Nvidia Corp has agreed to buy from SoftBank Group Corp in a $40 billion deal.