Asus ROG Crosshair VIII Dark Hero - Memory from QVL - D.O.C.P. Standard - The system has POSTed in safe mode

I have just built my new computer with Asus ROG Crosshair VIII Dark Hero motherboard, AMD Ryzen 9 5950X CPU and Corsair Dominator Platinum RGB Black DDR4 3600MHz 4x16GB - CMT64GX4M4Z3600C16 (Ver4.31) memory.

On a previous build a few years back I made the mistake of not looking at the memory QVL before buying my memory sticks and then tried to load XMP profile.

XMP causing POST safe mode - ASUS ROG STRIX Z370-F Gaming

This time I was not going to do the same mistake so I ordered memory that is made to work with Ryzen™ 5000 Series CPU:

Memory QVL for AMD Ryzen™ 5000 Series Processors_X570-4DIMM

https://rog.asus.com/us/motherboards/rog-crosshair/rog-crosshair-viii-dark-hero-model/helpdesk_qvl

https://dlcdnets.asus.com/pub/ASUS/mb/SocketAM4/ROG_CROSSHAIR-VIII-HERO_WI-FI/Memory_QVL_for_AMD_Ryzen_5000_X570-4DIMM.pdf

I also checked that the CPU I ordered was in the CPU support list which it is.

Ryzen 9 5950X (Vermeer) (3.4GHz,105W,L3:64M,16C)

https://rog.asus.com/us/motherboards/rog-crosshair/rog-crosshair-viii-dark-hero-model/helpdesk_cpu

Looking at the QVL it says this:

Vendors
CORSAIR 

Part No.
CMT64GX4M4Z3600C16(Ver4.31) 

Size
4x 16GB 

SS/DS
DS

Timing
16-18-18-36 

Voltage
1.35

DIMM socket support (Optional)
1 DIMM 2 DIMM 4 DIMM

Since I want to use 64GB I have every DIMM inserted.

Setting the D.O.C.P. Standard under Extreme Tweaker -> Ai Overclock Tuner sets the correct values when looking at timings above.

However this causes the following error:

The motherboard had BIOS version 3204 installed when delivered but I have also tried with 3302, 3401 and 3501 Beta. The same thing happens every time.

https://rog.asus.com/us/motherboards/rog-crosshair/rog-crosshair-viii-dark-hero-model/helpdesk_bios

Running D.O.C.P. Standard but changing Memory Frequency to DDR4-3333MHz instead of DDR4-3600MHz causes the system to boot but I don't know if it is stable or not yet there.

Have I missed something or is something wrong with the components?

I took a photo after applying thermal paste to the CPU that confirms the memory is correct part no, version and timing:

Complete computer specification:

• ASUS GeForce RTX 3090 ROG STRIX OC - 24GB GDDR6X RAM
• Corsair AX1000 V2 80+ Titanium 1000W
• AMD Ryzen 9 5950X with Noctua NH-D15
• ASUS ROG Crosshair VIII Dark Hero
• Samsung 980 Pro Series MZ-V8P2T0BW 2TB
• Corsair Dominator Platinum RGB Black DDR4 3600MHz 4x16GB - CMT64GX4M4Z3600C16 (Ver4.31)
• Fractal Design Define 7

Try to rule out the CPU/IMC by lowering the DDR Frequency and Infinity fabric clock to 3400/1700 respectively. I have this issue at IF clocks of 3800 or higher because my 5900x has a crappy IMC. I've never heard of one not being able to do 3600, however.

Thanks to @butt_yodel for pointing me in the right direction!

Setting FCLK Frequency to 1700MHz allowed me to run the memories at DDR4-3466MHz.

On Reddit I saw the comment Fclk = half memory speed.

https://www.reddit.com/r/Amd/comments/jxaj4m/what_is_the_default_fclk_for_a_5950x/

Since I tried to run DDR4-3600MHz I had to set FCLK Frequency to 1800MHz.

After doing this the computer booted fine!