Why not try modding your own bios to unlock shaders? That shouldn't be a problem for you.
Yes I did that the first day, but I want more overclock than 840.
So f I change vendor to assus in my bios, than smart doctor will work, and with smartdoctor you can increase your official overclock limit.
So the simple problem is, why i cant work with anything than my own bios(without changing vendor).