NordicHardware published a review of the Penryn architecture
                                    
                                    
Intel Penryn architecture dissected
                                
                            Thanks to the new 45nm process, the power leakage has been severely reduced, and we now have a much cooler and more efficient processor. But what does a refining of the process really mean? How much performance does the increased cache really bring?
Intel Penryn architecture dissected