The i7-950 and i7-975 are more evolutionary than revolutionary, or as many like to call them... "speed bumps", meaning that the architecture is the same, but the clocks experience a boost. Although Intel hasn't been entirely open about any other changes made, it's been rumored that minor changes have also been made to the chip to help improve overclocking, but we'll have to wait and see what overclockers can accomplish before we settle on that.
As you can see in the chart below, Intel currently has a huge line-up of CPUs (excluding Dual-Core), with five Core i7 total. Core i5 will soon be added to this list, but not until around late August/early September when the chips start to flow to the market. As it stands though, the top two models are the only to use a 6.4GT/s QPI, while the others use 4.8GT/s, although the real-world differences between the two are difficult to pinpoint. While we don't have an i7-950 on-hand, we do have an i7-975 Extreme Edition. So, let's see how it compares to our entire line-up of processors, including its predecessor, the i7-965.
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