Intel (INTC -2.27%) is set to begin a new phase of its history amid the sudden retirement of CEO Pat Gelsinger. Gelsinger spent most of his career at Intel. He helped to develop the i486 microprocessor in the 1980s, and Intel co-founder Andrew Grove mentored him before he moved on to other opportunities.With his past experience, the company's board hoped Gelsinger's return would help restore its former glory. Now that his retirement has dashed those hopes, David Zinsner and Michelle Johnston Holthaus will s ...