Depends on how many extra . of volts you could put in aslong as you can get rid of the heat i suppose. But wendell has managed to get 4.3 ghz on a taichi board whilst on linux. Having the ability to remove that fan offset, of which i have no idea why we have it will be key though, and on a bios level.
But dont just think about the speed of a ryzen through its pure ipc, there is something emerging with these chips that the infinity fabric is actually varied by ram speed, so the faster the ram the faster the cpu works internally via the infinity fabric working faster.
So thats something to keep an eye on, and also something in that, it turns out that whilst the shed isnt off in seeing the cpu, its still doesnt see it as a 2 cpu system, well it does and it doesnt but long story. If they can make the shed stop randomly jumping work and if they can make games not try and put work on cores that are related on the different blocks then we should see a good inprovment in game performance.
They also need to figure out what it is about windows 7 that makes ryzen so much faster in it than on windows 10.