"An increasing number of people within the industry have access to Intel Ivy Bridge engineering samples. Some of them are generous enough to share performance details with the public. One such kind soul posted 3DMark, Fritz Chess, and Cinebench test results. An Intel Core i7-3770 sample was the test candidate, this chip has all components and features available to Ivy Bridge LGA1155 enabled, including HyperThreading, a faster uncore, and the full 8 MB L3 cache. The chip was put through 3DMark 06 (to test its CPU and iGPU performance), Cinebench 11.5 (both single-thread and multi-threaded), and Fritz Chess Benchmark (again, both single and multiple threads)."
They should have put it up against a 2600k so we can see how much of a performance difference there is.
I would not expect too much. I've read numbers like ~15% performance increase. intel obviously uses this toc to reduce power consumption rather than cannibalise SB-E which they propably could do would they go for higher default clocks.
I personally like the reduction of power consumption. Others would prefer sheer POWA!!!