You dont unlock Xeons. They are cut via fuses. Like any non X/K CPU.
So yous dont think its possible
Non K sandies and ivies are overclockable 4 bins above turbo. This isn't the case on Xeons?
It's theoretically possible, but not practical. Some circuits are fused off at the factory. If you can find a really cheap way of reconnecting those connections, then you'd likely win the Noble prize in physics. Otherwise it's going to be cheaper to just buy a K cpu.
Thats not "unlock" as such. Thats turbobin OC.