Although 45nm quad-core mobile processors based on the Nehalem architecture have been available No specific details were mentioned but naming the Core i5 provides a clue to the likely performance traits of forthcoming MacBook laptops. Only three mobile Core i5 chips are available so far, clocked at 2.26GHz, 2.4GHz and 2.53GHz. If the leak is accurate, the new systems may appear at a rumored media event believed to be scheduled for January 27, where many are hoping to see an Apple tablet of sorts be unveiled as well.