Hi all! I would love to hear your experiences or ideas about my issues.
I am experiencing a critical and persistent memory stability failure when attempting to run my system with a Dual Channel configuration (2x32 GB). The issue is a severe boot loop/POST failure (DRAM Q-LED stays lit) that prevents me from even accessing the BIOS when both modules are installed.
The system is only stable and accessible when running with a single 32 GB module.
System Configuration Details
| Component | Specification |
| Motherboard | ASUS PRIME Z890-P WIFI |
| CPU | Intel Core Ultra 9 285K (Series 2) |
| Memory Kit | CORSAIR Vengeance 64 GB (2x32 GB) (CMK64GX5M2B5200C40) |
| BIOS Version | 2401 |
Detailed Chronology of Failure (Key Insights)
The issue appears to be an instability in the CPU's Integrated Memory Controller (IMC) under the specific load of 64 GB:
Initial Success: The system DID boot successfully with 2x32 GB for a short period when the CPU fan was undeliberately disconnected. This suggests the hardware is capable, but stability fails when the CPU is allowed to exit its low-power/safe mode?
Brief Second Success: After an initial boot loop, I managed to use a YouTube tutorial's trick (setting XMP1, DRAM VDD/VDDQ to 1.25V, and a PMIC value) with 1 stick, then installed the second. The system successfully booted into Windows.
Final Failure: The system froze shortly after reaching Windows. Upon reboot, the infinite loop returned, confirming the configuration was unstable under load and the system discarded the trained settings.
Extensive Troubleshooting Steps Performed
I have exhausted all known advanced BIOS adjustments to force stability, always starting with a Clear CMOS to ensure a clean state:
| Setting Category | Action Taken | Purpose/Result |
| Voltages (IMC) | VCCSA Boot Voltage set to High Voltage. | To give the IMC maximum power for high-capacity training. |
| Voltages (DRAM) | DRAM VDD/VDDQ set to a fixed 1.25V. | To match the voltage from the successful brief boot attempt. |
| Voltages (Signal) | VCCIO/VDDIO Memory set to 1.20V (or 1.25V). | To stabilize the memory I/O signaling plane. |
Tried Frequencies like 4000, 4800. No changes.
Tried PMIC mode per Module and not Synchronize all (as the youtube video suggested). Still nothing.
Despite all these efforts, the system still fails to boot with 2x32 GB.
Any ideas? Thanks in advance!!!
