2-6
X7DA3+ User's Manual
2-4 Installing DIMMs
Note: Check the Supermicro web site for recommended memory modules.
CAUTION
Exercise extreme care when installing or removing DIMM
modules to prevent any possible damage. Also note that the
memory is interleaved to improve performance (see step 1).
DIMM Installation (See Figure 2-2)
1. Insert the desired number of DIMMs into the memory slots, starting with Bank
1. (For optimal memory performance, please install four modules at a time.
Please refer to the table below.)
2. Insert each DIMM module vertically into its slot. Pay attention to the notch along
the bottom of the module to prevent inserting the DIMM module incorrectly.
3. Gently press down on the DIMM module until it snaps into place in the slot.
Repeat for all modules (see step 1 above).
Memory Support
The X7DA3+ supports up to 32 GB fully buffered (FBD) ECC DDR2 533/667 in 8
DIMMs. Populating DIMM modules with a pair (or pairs) of memory modules that
are of the same size and of the same type in Bank1, Bank2, Bank3 and Bank4 will
result in interleaving memory.
Note 1: Due to the OS limitations, some operating systems may not show more
than 4 GB of memory.
Note 2: 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.)
Optimized DIMM Population Configurations
Branch0 Branch1
Number of
DIMMs
Bank 1
(Channel 0)
Bank 2
(Channel 1)
Bank 3
(Channel 2)
Bank 4
(Channel 3)
2 DIMMs 1A ------ 2A ------ ------ ------ ------ ------
4 DIMMs 1A ------ 2A ------ 3A ------ 4A ------
6 DIMMs 1A 1B 2A 2B 3A ------ 4A ------
8 DIMMs 1A 1B 2A 2B 3A 3B 4A 4B
(*Notes: i. DIMM slot# specified: DIMM slot to be populated; “---“: DIMM slot not to
be populated. ii. Both FBD 533 MHz and 667MHz DIMMs are supported; however,
you need to use the memory modules of the same speed and of the same type on a
motherboard. iii. Interleaved memory is supported when pairs of DIMM modules are
installed. To optimize memory performance, please install pairs of DIMMs in both
Branch 0 and Branch 1. iv. For memory to work properly, you need to follow the
restrictions listed above. )
