In a presentation to partners Intel showed that the top of the range Sandy Bridge-E processor, the Core i7-3960X, which uses the LGA2011 socket is, on average, 47% faster than the previous generations flagship processor, the Core i7-990X.
Intel attributes this performance difference to the quad-channel DDR3 Integrated Memory Controller in the i7-3960X as well as the new AVX instruction which boosts math-heavy workloads like HD encoding. The Core i7-3960X is a six core processor that can handle 12 simultaneous threads. It has 15MB L3 cache and a clock speed of 3.3GHz. Turbo Boost pushes this up to 3.9GHz.