Memory Configurations - Asus P7F7-E WS SUPERCOMPUTER User Manual

2.4.2

Memory configurations

You may install 512MB, 1GB, 2GB and 4GB (total maximum 16GB)ECC and
non-ECC unbuffered DDR3 DIMMs into the DIMM sockets.
• 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.
• Due to Intel spec definition, X.M.P. DIMMs and DDR3-1600 are supported
for one DIMM per channel only.
• According to Intel CPU spec, DIMMs with voltage requirement over 1.65V
may damage the CPU permanently. We recommend you install the DIMMs
with the voltage requirement below 1.65V.
• 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.
• 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 3.6 Advanced menu for manual memory frequency adjustment.
• For system stability, use a more efficient memory cooling system to support
a full memory load (6 DIMMs) or overclocking condition.
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