After one year of dominating the enthusiast space, Intel's Core i7-3960X is being replaced. The new Core i7-3970X features higher clock rates, but also imposes a 150 W TDP. Just for kicks, we're putting it up against another 150 W CPU: the Xeon E5-2687W.
The Xeon is around 5-10% faster in the applications it wins in than the 3970X while having a 400MHz lower clock speed. I'm guessing that if both were at the same clock speeds, the Xeon would be a few percent faster. If they do a die shrink of the Xeon, I'm guessing there would be about a 10-15% increase in performance over the 3970X with their respecitve clock speeds, and about 15-20% if both were at the same clocks. Keep in mind that these are just rough estimations that I thought of off the top of my head
In my perspective, if Intel releases an IB-E eight core, it wouldn't be worth it to invest in, however much more it costs over the 6 core, because we can see the performance increases are marginal, and, to me, it isn't worth the premium, but I guess there's some people out there who can't wait 5 seconds