I have try alll combination of voltages, just like you said> DRAM 1.66V and 1.17,1.19,1.21,1.23,1.25,1.27,1.27,1.29,1.31,1.33,1.35,1.37,1.39.
And I didn't have any success.
Every POST have this message of warning>
The system has experienced boot features because of overclocking or changes of voltages. Last settings in BIOS setup may not coincide with current H/W states.
And frequency is back on 1333.