I am not an Asus specialist. Have you tried everything on Auto? XMP is still an OC state and that 128G density may require some increase in voltage such as the VDD and the SAV. However, I am a bit rusty on DDR4 since going over to DDR5 so I am not sure. I would suggest you clear the CMOS first and see if everything boots in a default state. You may consider testing the memory via the bios memtest86 before going into windows. Then report back and by then Scone will probably have seen your post to guide you further.
Hi there! Thanks for the reply.
memtest86+ is fine for >10 full passes. No errors at all.
The system is able to boot in a default state -- that is, using JEDEC speeds. It's also able to boot in cases 3 and 4 that I specified, except occasionally in warm reboots (that is, a restart) or wake from sleep.
Since this particular memory kit and config (with the 4 DIMMs, 128GB in total, and at the rated memory speeds) is explicitly listed in the QVL, the ASUS BIOS should definitely handle this in an automatic way when using XMP. Please note that in the QVL, as shown below, it's even stated that it's tested at 3600MT/s, even though I am having problems even while forcing lower/stock speeds supported by Raptor Lake (3200MT/s).