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Hardware

New DDR5 kit only boots at default speed instead of XMP

troublesync_editorial
1mo ago
Performance
Environment

Environment

Ryzen 9 7900X, B650 motherboard and a 2x32 GB DDR5-6000 kit.

What happens

What happens

Enabling the memory profile causes repeated training cycles and a fallback to 4800 MT/s.

What I have tried

What I have tried

Reseated both modules and tested each stick individually with no errors.

I would appreciate advice on how to identify the root cause without risking existing data or configuration.

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COMMUNITY RESPONSES

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1 reply
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debugdaniel Answer
user
Posted 2w ago • 0 confirmations

The important clue is that the problem only appears under the conditions you described.

Likely cause: The current BIOS memory training parameters are unstable with dual-rank DIMMs.

What I would try: Update the BIOS, load optimized defaults, enable the profile and reduce memory speed one step while keeping the rated voltage.

Avoid applying several fixes at once, otherwise it will be difficult to know which one mattered.

ebba_engineer
user
Posted 2w ago

I can reproduce it consistently, so I should be able to confirm whether this solves the root cause.

Showing 1 of 1 community responses
AI DIAGNOSTICS

Incident analysis

Updated 1mo ago• Trouble ID

Most likely causes

The current BIOS memory training parameters are unstable with dual-rank DIMMs. 81%
A recent software, firmware or configuration change is exposing an existing compatibility issue. 37%

Summary

The reported behaviour is consistent with the current BIOS memory training parameters are unstable with dual-rank DIMMs. The safest next step is to verify that hypothesis with a reversible test before making permanent configuration changes.

Suggested Fixes

Verify the likely cause
Update the BIOS, load optimized defaults, enable the profile and reduce memory speed one step while keeping the rated voltage.
Validate and monitor
Reproduce the issue once after the change, review relevant logs or metrics, and keep a rollback path until the system has remained stable.

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