Datasheet

2-6
X7DAL-E+ User's Manual
2-3 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
1. Insert the desired number of DIMMs into the memory slots, starting with DIMM
#1A. The memory scheme is interleaved, so you must install two modules
at a time, beginning with DIMM #1A, then DIMM #2A and so on. For optimal
performance, please install memory modules in both Branch1 and Branch 2 (4
modules maximum.) (See the Memory Installation 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 X7DAL-E+ supports up to 24 GB fully buffered (FBD) ECC DDR2 667/533
in 6 DIMMs. Populating DIMM slots with pairs of memory modules of the same
size and same type will result in Interleaved Memory which will increase memory
performance.
Note 1: Due to OS limitations, some operating systems may not show more than 4
GB of memory. (See the DIMM Population Confi gurations Table below.)
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 Memory Availability Table for
details.)
Optimized DIMM Population Configurations
Branch 1 Branch 2
Number of
DIMMs
Bank 1
(Channel 0)
Bank 2
(Channel 1)
Bank 3
(Channel 2)
Bank 4
(Channel 3)
2 DIMMs 1A ------ 2A ------ ------ N/A ------ N/A
4 DIMMs 1A ------ 2A ------ 3A N/A 4A N/A
6 DIMMs 1A 1B 2A 2B 3A N/A 4A N/A
(*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 memory in both
Branch 1 and Branch 2. iv. For memory to work properly, you need to follow the
restrictions listed above. )