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Memory congurations
You may install 1GB, 2GB, 4GB, 8GB unbuffered ECC or non-ECC DDR3 DIMMs
into the DIMM sockets depending on the installed CPU.
• You may install varying memory sizes in Channel A, Channel B, Channel C
and Channel D. The system maps the total size of the lower-sized channel
for the dual-channel conguration. Any excess memory from the higher-
sized channel is then mapped for single-channel operation.
• According to Intel CPU spec, DIMM voltage below 1.65V is recommended
to protect the CPU.
• The max. 64GB memory capacity can be supported with DIMMs of 8GB
(or above). ASUS will update QVL once the DIMMs are available on the
market.
• 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
®
support site at
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).
For system stability, use a more efcient memory cooling system to support a
full memory load (8 DIMMs) or overclocking condition.
P9X79 WS Motherboard Qualied Vendors Lists
Refer to www.asus.com for the Memory QVL (Qualied Vendors Lists).
2-6 Chapter 2: Hardware information