Good for you!
But, in terms of a thread on this forum, no-one has any idea what your talking about really, other than you've set your CPU voltage manually to 1.2
Listing your system specs exactly might help other users decide if your advice is good. You could be running an Intel system or an AMD system. Putting in 1.2v on an Intel CPU will work (CPU dependent), most likely won't work on a current AMD system.
Being more specific might help others.
Also, unless you are OC'ing your current CPU, your fix might not work in general terms. The mobo might be different, with different options. Some mobo's allow you to change the CPU voltage. Others don't. If you were OC'ing your CPU and experiencing stutters, I would put that down to an unstable OC. Your solution could very well fix your issue, but not for others with stuttering in game. There are many reasons why that could be. Memory issues, CPU issues, GPU (vram) issues.
Lots to consider.
Good luck and happy gaming