My 5Ghz bios settings. I used the ASUS AI suite II to perform the clock, so I've tried to interpolate the bios settings required.
Internal PLL overvoltage= Disabled
Digi+VRM
Load line calibration= High
VRM Frequency= Auto
VRM Speed spectrum= Disabled
Phase control= Optimized
CPU voltage= manual
CPU Manual voltage= 1.24v
This gave a Vcore of between 1.4v - 1.416v under load using Prime 95. The CPU hit 69C at max using a Noctua NH-D14.
The Dram frequency was set to 1333Mhz at this time, so it had little chanc eto cause any problems.
Hope this helps. I'm going to optimize the CPU at 4.8Ghz and increase Dram frequency, etc.