You are subject to rules set by intel for running turbo states for non-k multiplier OC. Intel allows you to set the multiplier 4 bins higher than the stock max turbo frequency. A 3770 has a max turbo of 3.9GHz, so you should be able to set 4.3GHz, but it is still considered a turbo frequency, so don't expect those clocks 24/7 as it will still obey rules and limitations of turbo (amount of current, length of time of turbo state, temperatures, etc).
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