Asus Z97-AR Manual page 18

Recommended memory configurations
1.4.2 Memory configurations
You may install 1 GB, 2 GB, 4 GB, and 8 GB unbuffered non-ECC DDR3 DIMMs into the
DIMM sockets. You can refer to the recommended memory population below.
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•
•
•
•
•
•
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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.
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
- Install a 64-bit Windows
motherboard.
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.
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 2.5 Ai Tweaker menu for manual memory
frequency adjustment.
Memory modules with memory frequency higher than 2133MHz and their
corresponding timing or the loaded XMP profile is not the JEDEC memory standard.
The stability and compatibility of the memory modules depend on the CPU's
capabilities and other installed devices.
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
®
Chapter 1: Product introduction
OS, when you install 4GB
®
®
OS.