Asus H81-Gamer User Manual page 16

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1-8
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 Intel chipset limitation, DDR3 1600 MHz and higher memory modules on XMP
®
mode will run at the maximum transfer rate of DDR3 1600 MHz.
Due to Intel chipset limitation, this motherboard can only support single-sided
®
memories when four modules are installed and they will run at the maximum transfer
rate of DDR3 1066MHz.
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.
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
following:
- Use a maximum of 3 GB system memory if you are using a 32-bit Windows
- I nstall a 64-bit Windows
motherboard.
- F or more details, refer to the Microsoft
com/kb/929605/en-us.
This motherboard does not support DIMMs made up of 512 Mb (64 MB) chips or less.
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.
For system stability, use a more efficient memory cooling system to support a full
memory load (4 DIMMs).
Visit the ASUS website at www.asus.com for the latest QVL.
OS if you want to install 4GB or more on the
®
support site at http://support.microsoft.
®
Chapter 1: Product introduction
OS, when you install 4GB
®
®
OS.