I'm writing through an interpreter, do not scold ...

Yes, the problem is in the memory of Hynix.
An interesting result of 17.5 mh/s is obtained if we decrease the memory frequency by -150. Try it. This indicates that the problem is in the timings.

Urgently need a BIOS programmer to replace timings. Or the finished BIOS is already replaced by timings.

Are ready to pay, who can find, which will crack the encrypted BIOS.