KB Article: ASUS RS700-E11-RS4U – Memory Population Guidelines

KB Article: ASUS RS700-E11-RS4U – Memory Population Guidelines

KB Article: RS700-E11-RS4U – Memory Population Guidelines

Warning: This applies only to the ASUS RS700-E11-RS4U server. Each server model is different, so please refer to the respective server motherboard manual before performing DIMM population

Summary

This knowledge base article explains the correct memory (DIMM) population rules for the RS700-E11-RS4U server. Following these guidelines ensures optimal system performance, maximum memory bandwidth, and system stability.

Applies To

- Server Model: RS700-E11-RS4U
- Manufacturer: ASUS
- Processor Support: AMD EPYC 7004 Series (SP5)
- Memory Type: DDR5 ECC RDIMM / DDR5 3DS RDIMM

Memory Architecture Overview

- 12 memory channels per CPU
- Up to 2 DIMMs per channel (1DPC / 2DPC)
- Maximum 24 DIMMs in dual CPU configuration
- ECC enabled by default

General Memory Population Rules

1. Use identical DIMMs for best performance.
2. Populate memory symmetrically across CPUs.
3. Always populate slot A before slot B in a channel.
4. Avoid mixing capacities or speeds.
5. Use ASUS QVL validated DIMMs.

 

Single CPU Memory Population

When only CPU1 is installed, populate memory slots associated with CPU1 only. Begin with one DIMM per channel before adding second DIMMs.

 

Dual CPU Memory Population

When both CPUs are installed, memory must be populated evenly across both processors. Maintain the same number of DIMMs per CPU.

1DPC vs 2DPC Configuration

1DPC: Best performance and higher memory frequency.
2DPC: Higher memory capacity with possible speed reduction.

Supported Memory Types

- DDR5 ECC RDIMM
- DDR5 ECC 3DS RDIMM
- Memory speed depends on CPU, DIMM rank, and population.

Common Issues Due to Incorrect Population

- System fails to POST
- Partial memory detection
- Reduced memory speed
- System instability

Verification Steps

1. Enter BIOS → Advanced → Memory Configuration
2. Verify detected memory and speed
3. Confirm DIMM placement matches motherboard labeling

Additional References

- RS700-E11-RS4U User Manual
- ASUS QVL
- AMD EPYC 7004 Memory Population Guidelines



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