As long as you can keep safe temps, then yes.
You'll find a lot of different opinions about what voltage to not exceed.
Some say 1.3, some 1.35, some 1.4
From what I've found, temps really start to ramp up after 1.3v and personally I like to keep it under 1.35v.
I'm currently running 4.6ghz @ 1.27 volts.
I can safely run up to 4.8ghz @ 1.32v but temps start to get a bit warm for my liking at that setting.