Can use manual vCore as well but for some reason with the current launch BIOS, the C6E has issue overclocking the Ryzen 7 1700 above 3.7GHz or vCore higher than 1.3V. CPU multiplier will stuck at 15.5x in the OS, inside UEFI it shows the correct OC though. My current workaround is to use offset vCore, then only multi above x37 will work in Windows.

It's a known issue for many other Ryzen mobos from other vendors as well, some including the C6H already received a fix BIOS to overcome this bug. ASUS BIOS engineers are so slow this time that it has been two months the C6E still hasn't get any BIOS update yet since launch.

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Related: https://rog.asus.com/forum/showthread.php

You would think if they've released a fix for C6H, considering how much similarities C6H and C6E are, they wouldn't need to reinvent the wheel to release a fixed bios for C6E as well within reasonable time frame.

Aside from cpu multiplier and vcore voltage (whether static/manual or offset) any other settings I need to look at? Initially I'm only looking to get a stable 3.85 or 3.9ghz oc. Less likely to be lucky again like I did with my previous 3770k (4.6ghz 1.195vcore daily use).

Yes, first step of OC is always combo of CPU multiplier + voltage 
If you want to discover further can go through the OC guides listed in the top post of this thread.

You C6E has cool boot issue? I'm using pstate OC my ryzen, i have a problem when my pc having cool boot twice when i switch on the pstate oc will always restore to default setting

As I am still in the progress of testing some DDR4 RAMs, so it is usual to get cold boot.
Not sure about your UEFI settings, could be RAM timing set to tight or insufficient vDIMM or vSOC.
Use DOCP profile, DRAM boot voltage 1.4v.
Or maybe the IMC needs more juices, try increasing the vSOC to 1.15-1.20v.

I'm using DOCP standard, my ram is 3200mhz cl14 so i just set it as auto without adjusting timing. DRAM boot vol set to 1.35v & vSOC 1.1.

DRAM vBoot voltage setting is located at Extreme Tweaker > External Digi+ Power Control > scroll down to the bottom:

DRAM vBoot: 1.40V (initial boot voltage)


Eventual DRAM voltage: 1.38V (my case, inside OS you will see this value)


For RAM timings you might want to follow guide from The Stilt
http://www.overclock.net/t/1624603/rog-cro...0#post_26178558

My RAM now don't want to run at DDR4 3333 already, as if it broke down or something.

finally @ 3200, 2T thou... 

wow Hynix-AFR!
How many RAM kits do you have bro?

another pair of rgb 3466... 



2t efficiency really can't make it 

Well done bro!
My 3466 C16 1T is not stable in HCI MemTest even pumped with excessive VDIMM and vSOC. 
Need to tweak it further or 2T or reduce the memory frequency to 3333 haiya.
Also waiting for new BIOS from ASUS, launch BIOS sucks 

Still below par bro, i really hope i can see 3466 but thing is msi is slow to update d agesa in their bios. 1006b is out for manufacturers like asus/giga but for msi official bios not even with 1006a. Sigh. Hopefully d upcomin bios will do wonders. Not askin for 3600 like d big boys, 3466 prime stable is good enuf...

Initial bios usually sucks... Patient bro...

Version: 7A34v18
Release Date: 2017-09-14
File Size: 8.3 MB

Description
- Improved memory compatibility.
- Update AGESA Code 1.0.0.6b