System Memory; Overview; Memory Configurations - Asus P8B75-M LE User Manual

1.7

System memory

1.7.1

Overview

The motherboard comes with two Double Data Rate 3 (DDR3) Dual Inline Memory Modules
(DIMM) sockets. A DDR3 module has the same physical dimensions as a DDR2 DIMM but
is notched differently to prevent installation on a DDR2 DIMM socket. DDR3 modules are
developed for better performance with less power consumption.
The figure illustrates the location of the DDR3 DIMM sockets:
P8B75-M LE
P8B75-M LE 240-pin DDR3 DIMM sockets
1.7.2

Memory configurations

You may install 1GB, 2GB, 4GB and 8GB unbuffered non-ECC DDR3 DIMMs into the DIMM
sockets.
• You may install varying memory sizes in Channel A and Channel B. The system maps
• Always install DIMMs with the same CAS latency. For optimum compatibility, we
• Due to the memory address limitation on 32-bit Windows
• This motherboard does not support DIMMs made up of 512Mb (64MB) chips or less.
• The default memory operation frequency is dependent on its Serial Presence Detect
• For system stability, use a more efficient memory cooling system to support a full
1-14
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.
recommend that you obtain memory modules from the same vendor.
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 3GB system memory if you are using a 32-bit Windows
- Install a 64-bit Windows
motherboard.
(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. To operate at the vendor-marked or at a
higher frequency, refer to section 2.4 Ai Tweaker menu for manual memory frequency
adjustment.
memory load (2 DIMMs) or overclocking condition.
Channel
Channel A
Channel B
OS when you want to install 4GB or more on the
®
Sockets
DIMM_A1
DIMM_B1
OS, when you install 4GB
®
OS.
®
Chapter 1: Product introduction