ASUS 90SB0390M0AAY0 用户手册

ASUS Z87-WS

1-13

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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.

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According to Intel

®

 CPU spec, a DIMM voltage below 1.65V is recommended to 

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. 

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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:
a)  Use a maximum of 3GB system memory if you are using a 32-bit Windows

®

 OS.

b)  Install a 64-bit Windows

®

 OS when you want to install 4GB or more on the 

motherboard.

c)  For more details, refer to the Microsoft

®

 support site at http://support.microsoft.

com/kb/929605/en-us.

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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).

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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 

value or at a higher frequency, refer to section 3.5 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.

• 

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.

• 

Always install DIMMS with the same CAS Latency. For optimum compatibility, we 

recommend that you install memory modules of the same version or data code (D/C) 

from the same vendor. Check with the vendor to get the correct memory modules.

You may install 2GB, 4GB and 8GB unbuffered and non-ECC DDR3 DIMMs into the DIMM 

sockets.