http://www.primatelabs.ca/blog/2008/02/macbook-pro-performance-february-2008/ Their conclusion: At first glance the results seems counter-intuitive; shouldnt the new MacBook Pro @ 2.4GHz be faster than the old MacBook Pro @ 2.4GHz? Isnt the Penryn better than the Merom? It turns out the answer is, not necessarily. The processor in the new MacBook Pro @ 2.4GHz (T8300) has less L2 cache than processor in the old MacBook Pro @ 2.4GHz (T7700) which explains the slight drop in performance. However, when you consider the new MacBook Pro 2.4GHz is the base model, while the old MacBook Pro 2.4GHz was the mid-range model, the small drop in performance comes with a significant reduction in price. Plus, the new Penryn processor uses less energy than the old Merom processor, which means a cooler laptop with increased battery life.