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System Memory - Asus EX-B85M-V Manual

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System memory

This motherboard comes with two Double Data Rate 3 (DDR3) Dual Inline Memory Module
(DIMM) sockets. The figure illustrates the location of the DDR3 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
Due to Intel
chipset limitations, DDR3 1600 MHz and higher memory modules on
XMP mode will run at the maximum transfer rate of DDR3 1600MHz.
Always install DIMMs with the same CAS latency. For optimal compatibility, we
recommend that you install memory modules of the same version or date code (D/C)
from the same vendor. Check with the retailer to get the correct memory modules.
According to Intel
CPU spec, DIMM voltage below 1.65V is recommended to protect
the CPU.
Due to the memory address limitation on 32-bit Windows
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
Use a maximum of 3GB system memory if you are using a 32-bit Windows
Install a 64-bit Windows
For more details, refer to the Microsoft
This motherboard does not support DIMMs made up of 512 megabits (Mb) chips or
Memory modules with memory frequency higher than 2133 MHz and its corresponding
timing or the loaded X.M.P. Profile is not the JEDEC memory standard. The stability
and compatibility of these memory modules depend on the CPU's capabilities and
other installed devices.
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 (2 DIMMs).
Refer to for the latest Memory QVL (Qualified Vendors List)
Channel A
Channel B
OS if you want to install 4GB or more on the
support site at
Chapter 1: Product introduction
OS, when you install 4GB


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