Here are some news of my setup..
Currently I don't have a lot of times to optimize setup, however, since my last benchmarks, I made some interesting discoveries :
WHEA :
Windows Hardware Error are a critical point to check while overclocking (or even not). I've read a lot of type of errors, and I'm far from behind alone to face that on Ryzen. Root cause is coming from CPU micro code and Motherboard bios. Due to "marketing" purpose (or if I'm gentle, bios maturity on new Ryzen platform), motherboards seem to have unlock / badly setup some paramters resulting in those WHEA (facing them heavy cpu load, ie intel burn test with linpack is pretty quick to generate whea, cinebench, video encoding...). I don't really if it was done by purpose (hoping not), it's resulting simply that OC a ryzen cpu is more difficult now compared to earlier bios. Ryzen cpu needs more juice than before, resulting to a decrease of OC at same vcore...
On bios 1403 of Crosshair Hero VI (first to implement agesa 10.0.06a) i was able a stable 4.0ghz @1,52v or a 3.9Ghz @1,4375v back to july-august 2017)...however it was only supercially stable as I've redone all my testings...and I was never able to avoid WHEA even on 3.9Ghz...I even got some WHEA @3.8Ghz with this Bios 1403...holy crap.
I guess that the reason why Asus is continuing to publish new bios (ie 1701) with a vague note of "improving stability"...indeed with this bios 1701, I'm able to run an OC 3,85Ghz @1,4375v smooth and stable, WHEA free..
I'm pretty sure also that's why Asus and others motherboards manufacturers are not putting in place new agesa 10.0.0.6b or even 10.0.0.7 (introducing new architecture of micro code...and new ryzen-vega apu).
COLD START :
Ryzen is still struggling to properlly train RAM on cold start. Except a specific beta bios that was focused to help b-die ram kit on crosshair, most of the time, ram support on ryzen needs improvement.
However a nice feature was introduced to simply specify numbers of retries when booting. In my personal case I just put 3 times, and computer is booting, rebooting till everything is not ok. As a result, my setup is booting on second attempt as it required only a slight warm ram..
In final this retry tweak is taking as long as "specific" training from beta bios 9920...so fine for me.
COOLING CAPACITY :
I'll praise again combo Cerberus-X and Noctua C14S with dual 140 fans...I didn't not realize that cooling power since I saw some benchmarks between noctua coolers vs asetek kit on Threadripper...with a surprising victory from Noctua U14S over nzxt X62...
What I can witness with my Ryzen setup is that Noctua C14S is able to handle a OC Ryzen 7 (summit ridge) @3,9Ghz, @1,4375v (around 150W), bios 1701 Asus C6H (creating some whea by the way) stable @76°C (room around 20°C). Versus a asetek 240mm AIO solution, it should be around 5°C warmer maximum (after temperature balance, that is taking 20-40 min on watercooling solution)
The only way to be sure will be to put again my Apogee drive II in position..
No matter I'll try to optimise case fan flow (rear and top) and I'll let you know..
I'm eager to see other builds in Cerberus-X as everybody has their own solutions/thoughts..