http://www.hothardware.com/articles/Intel_Core_2_Duo_E6750_Performance_Preview/?page=2
This time around, however, our results were nothing short of spectacular. By bumping the processor's core voltage to 1.45v and increasing the front side bus speed via our Asus P5K Deluxe motherboard's BIOS, we were able to take the Core 2 Duo E6750 up from its default clock speed of 2.6GHz to an impressive 3.92GHz (multiplier=8x / Front Side Bus Frequency=490MHz. This was done using the stock Intel CPU cooler on an open-air test bench. At that speed, the CPU completed a Cinebench rendering pass in just 18 seconds and it blew past the Core 2 Extreme X6800 in SANDRA's Processor Arithmetic benchmark.