Which voltage. There's a very big difference between setting vcore, SVI2 and VID.
Vcore is what the cpu demands + LLC, SVI2 is what the cpu actually uses, VID is what the motherboard VRM's supply.
Left on auto, the cpu thinks about its loads, adds in LLC and demands higher voltages from the VRM's than it realistically needs, just to cover all the bases. The motherboard is happy to supply that, and then the cpu only uses some of that.
So limiting VID is like asking mom for $10 and she laughs and gives you $5 and tells you to make do. Overall, that's a benefit, reduces heat, reduces stress on the VRM's, keeps vcore and SVI2 at reasonable levels. Setting a solid vcore has the opposite affect, you must set it high enough to cover single core demands and also multi core demands, but then LLC adds voltage to help with vdroop and stability. So you may set 1.325v solid, but only use 1.125v but the cpu gets supplied 1.375v VID or higher to cover everything if you've got funky vdroop.
So if just setting vcore, you are setting yourself up for failure, you must take LLC into consideration as well, and current limits, load turbo timers etc.
My 3700x runs a 1.232v VID and still gets 4.4GHz boost on many cores, 4.28GHz all core, vcore running @ 1.205v and SVI2 running 1.18-1.2v