Asus ROG STRIX X399-E GAMING User Guide - Page 20

Memory configurations, Product Introduction

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Chapter 1 Memory configurations You may install 2 GB, 4 GB, 8 GB and 16 GB unbuffered ECC and non-ECC DDR4 DIMMs into the DIMM sockets. • You may install varying memory sizes in Channel A, Channel B, Channel C, and Channel D. The system maps the total size of the lower-sized channel for the quad channel configuration. Any excess memory from the higher-sized channel is then mapped for single-channel operation. • This motherboard does not support DIMMs made up of 512 Mb (64 MB) chips or less (Memory chip capacity counts in Megabit, 8 Megabit/Mb = 1 Megabyte/MB). • The default memory operation frequency is dependent on its Serial Presence Detect (SPD), which is the standard way of accessing information from a memory module. Under the default state, some memory modules for overclocking may operate at a lower frequency than the vendor-marked value. • For system stability, use a more efficient memory cooling system to support a full memory load (8 DIMMs) or overclocking condition. • Always install the DIMMS with the same CAS Latency. For an optimum compatibility, we recommend that you install memory modules of the same version or data code (D/C) from the same vendor. Check with the vendor to get the correct memory modules. • Visit the ASUS website for the latest QVL. 1-6 Chapter 1: Product Introduction

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1-6
Chapter 1: Product Introduction
Chapter 1
Memory configurations
You may install 2 GB, 4 GB, 8 GB and 16 GB unbuffered ECC and non-ECC DDR4 DIMMs
into the DIMM sockets.
•
You may install varying memory sizes in Channel A, Channel B, Channel C, and
Channel D. The system maps the total size of the lower-sized channel for the quad
channel configuration. Any excess memory from the higher-sized channel is then
mapped for single-channel operation.
•
This motherboard does not support DIMMs made up of 512 Mb (64 MB) chips or less
(Memory chip capacity counts in Megabit, 8 Megabit/Mb = 1 Megabyte/MB).
•
The default memory operation frequency is dependent on its Serial Presence Detect
(SPD), which is the standard way of accessing information from a memory module.
Under the default state, some memory modules for overclocking may operate at a
lower frequency than the vendor-marked value.
•
For system stability, use a more efficient memory cooling system to support a full
memory load (8 DIMMs) or overclocking condition.
•
Always install the DIMMS with the same CAS Latency. For an optimum compatibility,
we recommend that you install memory modules of the same version or data code
(D/C) from the same vendor. Check with the vendor to get the correct memory
modules.
•
Visit the ASUS website for the latest QVL.