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ERX-Q77
User’s Manual
ERX-Q77
User’s Manual
31
2.6.2 Memory Configurations
You may install 1 GB, 2 GB , and 4 GB unbuffered ECC or non-ECC DDR3 DIMMs into the
DIMM sockets using the memory configurations in this section.

IF you installed four 1GB memory modules, the system may detect
less than 3GB of total memory because of address space allocation
for other critical functions. This limitation applies to Windows XP
32-bit version operating system since it does not support PAE
(Physical Address Extension) mode.

IF you install Windows XP 32-bit version operating system, we
recommend that you install less than 3GB of total memory.

For dual-channel configuration, the total size of memory module(s)
installed per channel must be the same for better performance
(DIMMA2=DIMMB2).

When using one DDR3 DIMM module, install into DIMMB1 slot only.

When using two DDR3 DIMM modules, install into DIMMA1 and
DIMMB1 slots only.

Always install DIMMs with the same CAS latency. For optimum
compatibility, it is recommended that you obtain memory modules
from the same vendor. Refer to the memory Qualified Vendors List
on the next page for details.

Due to CPU limitation, DIMM modules with 128 Mb memory chips or
double-sided x16 memory chips are not supported in this
motherboard.
2.6.3 Installing a SO-DIMM
1. Unlock a DIMM socket by pressing the retaining clips outward.
2. Align a DIMM on the socket such that the notch on the DIMM matches the break on the
socket.