User's Manual

Chapter 5: Advanced Serverboard Setup
5-7
5-5 Installing Memory
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 inter-
leaved to improve performance (see step 1).
DIMM Installation (See Figure 5-5)
1. Insert the desired number of DIMMs into the memory slots, starting with slot
DIMM#1A and DIMM#2A. The memory scheme is interleaved so you must install
two modules at a time. See the memory confi guration chart 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 X7DBU supports up to 32 GB of ECC FBD (Fully Buffered DIMM) DDR2-667
or DDR2-533 SDRAM. The memory is an interleaved confi guration, which requires
modules of the same size and speed to be installed in pairs. You should not mix
DIMMs of different sizes and speeds.
Optimized DIMM Population Configurations
Branch 0 Branch 1
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. “---“ indicates a 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 type. iii. Interleaved memory is supported
when pairs of DIMM modules are installed. For best performance, please install
memory modules in both Branch 0 and Branch 1. iv. For memory to work
properly, you need to follow the restrictions listed above.