I think this motherboard is defective when now i cant even get stock docp 3600 14-14-14-34 working.
And this is my second cpu because old 5950x did not work at all with this motherboard.
And those m2 slots is still useless when its drops gpu to 8x mode in my opinion is waste of money to put them there.
3600 14-14-14-34 is a fairly aggressive overclock for DDR4. There's nothing on the QVL for 14-14-14-34 and a 4 DIMM config at 3600. The fastest timings for 3600 I can see on the QVL are 14-15-15-35 @ 1.45V for Samsung chips on a Team TF10D48G3600HC14CBK. You almost certainly need to back off your RAM timings a bit.
The potential for a 21 GBytes per second system drive may seem useless to you, but it's there as an option for people who want supercharged storage speed. Running the GPU at 4.0 x8 is not a huge performance penalty for many use cases, and is certainly not running the current GPUs at half of their performance potential for most normal usage. There are very few scenarios that make full use of 4.0 x16 bandwidth. The limited lanes of the Intel and AMD desktop platforms mean that x8 mode is a necessary sacrifice if you want the ability to use CPU IO bandwidth for another purpose. At the high end of desktop platforms, you need to properly research the boards before you buy them, to see if the IO configuration is what you want/need.
I run with same ram 3733 cl 14-14-14-32 1T gdm on before so its a motherboard issue. Two latest bios versions at least has this issue and i i had tried 3 different ram kits and all behave the same.
And its b die so it should work fine without any qvl listings because its never uppdated on the supportt site and g.skill has it listed as compatible.