Asus TUF SABERTOOTH 990FX R3.0 SABERTOOTH 990FX R3.0 Users Manual English - Page 20

Memory configurations

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Chapter 1 Memory configurations You may install 1 GB, 2 GB, 4 GB and 8 GB unbuffered and non‑ECC DDR3 DIMMs into the DIMM sockets. • 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. • 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: a) Use a maximum of 3GB system memory if you are using a 32-bit Windows® OS. b) Install a 64-bit Windows® OS when you want to install 4 GB or more on the motherboard. c) For more details, refer to the Microsoft® support site at http://support.microsoft. com/kb/929605/en-us. • The design of the DIMM fan may vary. Ensure that the DIMM fan fits to the motherboard • 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. • Hyper DIMM support is subject to the physical characteristics of individual CPUs. Load the X.M.P. or D.O.C.P. settings in the BIOS for the hyper DIMM support. • 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
•
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.
•
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:
a)
Use a maximum of 3GB system memory if you are using a 32-bit Windows
®
OS.
b)
Install a 64-bit Windows
®
OS when you want to install 4 GB or more on the
motherboard.
c)
For more details, refer to the Microsoft
®
com/kb/929605/en-us.
•
The design of the DIMM fan may vary. Ensure that the DIMM fan fits to the
motherboard
•
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.
•
Hyper DIMM support is subject to the physical characteristics of individual CPUs. Load
the X.M.P. or D.O.C.P. settings in the BIOS for the hyper DIMM support.
•
Visit the ASUS website for the latest QVL.
Memory configurations
You may install 1 GB, 2 GB, 4 GB and 8 GB unbuffered and non-ECC DDR3 DIMMs into the
DIMM sockets.