Driverheaven.net posted a review on the Intel Core i7 975 Extreme Edition CPU

Nehalem EP used the same D0 core as that found in the new 920 which left the top performing 965 processor on the older C0 revision. Rather than change the CPU to bring it up to date Intel are once again pushing the market forward with the release of the Core-i7 975 Extreme Edition and we will be putting it through its paces in a selection of mainly real world tests to establish how much of an improvement it is over the existing models in the range.

Intel Core i7 975 Extreme Edition CPU Review