Andy

To pass it by is to lose it evermore; record it well, lest memory fail thee.

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Question: I’ve installed 768GB (96GB x8) in an R2513G6 system. Why can I only see half the memory capacity (384GB)?

Memory capacity showing only 384GB instead of the installed 768GB

Memory summary confirming half capacity is reported

Answer

This symptom may be caused by one or more defective memory modules.

Please boot the R2513G6 into BIOS and change the following BIOS setting:

Socket Configuration → Memory Configuration → Enforce Population POR

Change this setting from Enabled to Disabled.

BIOS setting: Enforce Population POR changed from Enabled to Disabled

Result

After saving and restarting the R2513G6, you’ll see that one 96GB memory module is now reported as missing.

Memory summary after the change, showing one missing 96GB module

Total capacity now reflecting the missing module

You can then check Memory Topology to identify which memory module is missing (in this case, P0_CHH_DIM0). This event can also be found in the BMC event log.

Memory Topology screen identifying the missing DIMM at P0_CHH_DIM0

BMC event log entry recording the missing memory module

Summary: With Enforce Population POR enabled, a defective DIMM can cause the BIOS to silently disable an entire memory channel/region as a safety measure, resulting in only half the installed capacity being reported. Disabling this setting allows the system to boot with only the specific defective module excluded, making it visible in both the memory topology and BMC event log — which lets you pinpoint exactly which DIMM needs to be replaced.

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