Memory Configurations - Asus Z77-A User Manual

1.5.2

Memory configurations

You may install 1GB, 2GB, 4GB and 8GB unbuffered non-ECC DDR3 DIMMs into the DIMM
sockets.
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Visit the ASUS website for the latest QVL.
Z77-A Series Motherboard Qualified Vendors Lists (QVL)
DDR3 2400MHz capability
Vendors Part No.
Transcend TX2400KLU-4GK (381850)(XMP) 4GB(2x 2GB)
* The 2400MHz memory modules above are supported on Intel
however, the actual frequency support varied depending on the O.C. margin of the installed CPU.
1-12
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.
According to Intel CPU specifications, DIMM voltage below 1.65V is recommended to
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protect the CPU.
Always install DIMMs with the same CAS latency. For optimum compatibility, we
recommend that you obtain memory modules from the same vendor.
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:
- Use a maximum of 3GB system memory if you are using a 32-bit Windows OS.
- Install a 64-bit Windows OS when you want to install 4GB or more on the
motherboard.
- For more details, refer to the Microsoft
http://support.microsoft.com/kb/929605/en-us.
This motherboard does not support DIMMs made up of 512Mb (64MB) chips or less
(Memory chip capacity counts in Megabit, 8 Megabit/Mb = 1 Megabyte/MB).
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 2.4 Ai Tweaker menu for manual memory
frequency adjustment.
For system stability, use a more efficient memory cooling system to support a full
memory load (4 DIMMs) or overclocking condition.
Size
® support site at
C h i p Chip
SS/DS Timing
Brand NO.
SS - - 9
3rd generation processors by this motherboard;
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Chapter 1: Product introduction
D I M M s o c k e t s u p p o r t
(Optional)
Voltage
1 DIMM 2 DIMMs 4 DIMMs
1.65V • •