1.2v is a bit optimistic, I need 1.29v for 4.5GHz on a good motherboard. It all depends on the CPU. You may need anything from 1.18v to 1.3v for 4.4 imo.
You are better off using the stock voltage, and increasing the clock until it fails to remain stable, then adjust voltage a bit and raise clock more until you find your 4.4 voltage.
Is this with the stock heatsink? 4.4 on that thing is likely going to be loud.