Asus Rog Crosshair Gene x670e: DDR5 memory context restore weird problem

[bulissimo]

Hi all.
I don't know if this is the right section, so I apologize if not
My Build:

- MOBO: Asus Rog Crosshair Gene x670e with latest Bios (version 2007, date 2024/04/18);
- CPU: AMD Ryzen 7 7800x3D
- DDR5: 32 Gb RAM G-Skill Trident Z5 Neo RGB (A-Die) with EXPO 6000 Mhz CL30

Problem description:
with EXPO profile enabled in Bios, even if memory context restore is set to "enabled" (and power down mode too), this does not speed up the post time: I clearly can see, from the leds on the mobo Q-Code display, that the ram retraining is done anyway.
No matter if I set EXPO I, EXPO II or EXPO TWEAKED; and what's more, the problem appeared also with previous Bios versions

BUT:
If I disable EXPO by setting DDR5 values manually (and I've done so, overclocking my ram till 6400 Mhz CL30), in this case (JUST in this case) setting memory context restore to "enable" speeds up the post time .. but the problem is that I don't want to stay so long with the ram oc, 'cause I noticed some random instability when gaming.

.. and this happens regardless if I enable tweaks on the cpu (default parameters or pbo + c.o. .. it's the same)

How to figure out why this behaviour? How can I make "memory context restore enable" work simply by enabling EXPO on my DDR5?

thanks in advance

 

[Woomack]

I gave this mobo to my brother, but if I'm right, he has the same problem with RAM at XMP/EXPO. At least I remember it taking a while to boot each time. When I had it, ASUS was working on the solution.
If it works at manual settings, then just load the XMP/EXPO profile, save settings, restart, enter the BIOS, and set manually all timings as shown in greyed-out. Then, save the user profile.

 

[bulissimo]

yes, You are right: I'll try in this way

but, meanwhile, I gave a look in the boot options of the bios and tried to disable fastboot

the expected result was a longer boot time but, instead, it seams much much faster than before.

don't ask me why .. it does not make any sense, I know ..