I recently purchased an i7-4820k and don't like the way the turbo bins are set up by default. Only when 1 core is active does it turbo boost. When 2 to 4 cores are active then there is no turbo boost. The i7-3770k which is the mainstream high-end Ivy Bridge has more aggressive turbo boosting. It turbos 1 and 2 cores active to 3.9GHz, 3 cores active to 3.8GHz, and 4 cores active to 3.7GHz by default. The base clock is higher in the 4820k than the 3770k but real world performance is mainly in the turbo boosts. Will it be a problem setting up all my cores to turbo to 3.9GHz on my 4820k with vcore on auto or at least to turbo 1-2 cores active to 3.9GHz and 3-4 cores active to 3.8GHz?
