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X7DCL-3/X7DCL-i User's Manual
Memory Support
The X7DCL-3/X7DCL-i supports up to 48 GB Single-Rank/Dual Rank, Registered
ECC DDR2 667/533 in 6 DIMMs (The amount and type of memory supported is
dependent on the PCB revision. See Note 1 Below). Populating DIMM slots with
pairs of memory modules of the same size and same type will result in Inter-
leaved Memory which will improve memory performance.
Note 1: For the PCB Rev. 1.1 motherboard, Slots 1A and 2A support Dual-Rank
modules; however, Slots 1B, 2B, 1C and 2C support Single-Rank memory only
(Maximum of 32 GB). The PCB Rev. 1.1a board supports 6 Dual-Rank or 6 Single-
Rank modules (Maximum of 48 GB).
Note 2: Due to OS limitations, some operating systems may not show more than
4 GB of memory.
Note 3: Due to memory allocation to system devices, memory remaining available
for operational use will be reduced when 4 GB of RAM is used. The reduction in
memory availability is disproportional. (Refer to the following Memory Availability
Table for details. For Microsoft Windows users: Microsoft implemented a design
change in Windows XP with Service Pack 2 (SP2) and Windows Vista. This change
is specic to the Physical Address Extension (PAE) mode behavior which improves
driver compatibility. For more information, please read the following article at Micro-
soft’s Knowledge Base website at: http://support.microsoft.com/kb/888137.
Optimized DIMM Population Configurations
No. of
DIMMs
Channel 0 Channel 1
2DIMMs DIMM 1A ------ ------ DIMM 2A ------ ------
4DIMMs DIMM 1A DIMM 1B ------ DIMM 2A DIMM 2B ------
6DIMMs DIMM 1A DIMM 1B DIMM 1C DIMM 2A DIMM 2B DIMM 2C
(Notes: i. DIMM slot# specified: DIMM slot to be populated; “---“: DIMM slot not to be
populated. ii. Both Registered ECC DDR2 667MHz and 533 MHz DIMMs are supported;
however, you need to use the memory modules of the same speed and of the same type on
a motherboard. iii. For memory to work properly, you need to follow the restrictions listed
above. )