System memory. Asus H170-PRO/USB 3.1

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System memory

Overview

This motherboard comes with two Double Data Rate 4 (DDR4) Dual Inline Memory Module

(DIMM) sockets. A DDR4 module is notched differently from a DDR, DDR2, or DDR3 module.

DO NOT install a DDR, DDR2, or DDR3 memory module to the DDR4 slot.

DIMM_A1

DIMM_A2

DIMM_B1

DIMM_B2

Channel

Channel A

Channel B

Sockets

DIMM_A1 & DIMM_A2

DIMM_B1 & DIMM_B2

• You may install varying memory sizes in Channel A and Channel B. The system maps the total size of the lower-sized channel for the dual-channel configuration. Any excess memory from the higher-sized channel is then mapped for single-channel operation.

• 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.

• According to Intel

®

CPU spec, DIMM voltage below 1.35V is recommended to protect the CPU.

• Due to the memory address limitation on 32-bit Windows ® OS, when you install 4GB or more memory on the motherboard, the actual usable memory for the OS can be about 3GB or less. For effective use of memory, we recommend that you do any of the following:

- Use a maximum of 3 GB system memory if you are using a 32-bit Windows

®

OS.

- Install a 64-bit Windows

®

OS if you want to install 4GB or more on the motherboard.

- For more details, refer to the Microsoft ® com/kb/929605/en-us.

support site at http://support.microsoft.

Visit the ASUS website at www.asus.com for the latest QVL.

Installing a DIMM

1 2

A

A

B

To remove a DIMM

B

A

Chapter 1: Product introduction