Asus P9X79-E WS User Manual page 32

Memory configurations
You may install 1GB, 2GB, 4GB, 8GB unbuffered ECC or non-ECC DDR3 DIMMs into the
DIMM sockets depending on the installed CPU.
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For system stability, use a more efficient memory cooling system to support a full memory
load (8 DIMMs) or overclocking condition.
P9X79-E WS Motherboard Qualified Vendors Lists
Refer to www.asus.com for the Memory QVL (Qualified Vendors Lists).
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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 configuration. 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
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).
support site at
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Chapter 2: Hardware information