Overclockers Club takes a further look at the Intel E6750 CPU (2.66GHz / 1333MHz). Here's a taster:

At stock speeds, the performance of the E6750 was equal to the E6700 it replaced. It should be, as both the E6700 and E6750 run at the same speed of 2.66GHz. Theoretically, the 6750 should perform slightly better due to the higher front side bus, but that proved to be a non-issue and performance was right where it should be. Where this CPU really shows its worth to me is when it is overclocked. It was able to reach higher speeds at lower volts and temperatures than any of the other Core2Duo chips I have had. The performance per dollar spent makes this new line of 1333 FSB processors a tremendous value. If you consider the fact that the E6750 comes in at a price $18 dollars less than the E6600, and $108 less than the E6700 it replaces, you really cannot go wrong. If you don't do any overclocking and have an E6700 or better, there really is no need to upgrade unless you want to just have the latest and greatest thing out there. On the other hand, if you are an enthusiast and are always on the lookout for that high performance chip, then this may be just the ticket for that next high performance upgrade.