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).
AMD Ryzen Threadripper 2950X
Asrock X399 Taichi
2x G.SKILL F4-4000C19D-32GTZSW (4x16GiB 4000MHz 19-19-19-39-2T)
EVGA NVIDIA GeForce GTX 1080 Ti FTW3
Seasonic PRIME 1300W 80+ Platinum