2-6
X7DWE User's Manual
Memory Support
The X7DWE supports up to 32 GB fully buffered (FBD) ECC DDR 2 800/667/533
in 4 DIMMs. Please note that DDR2 FBD 800 MHz memory is supported by the
processors with FSB 1333 MHz and 1066 MHz; however, it will run @667 MHz.
Note 1: Due to OS limitations, some operating systems may not show
more than 4 GB of memory.
Note 2: Different types of memory modules are supported by processors
with different front side bus speeds. Refer to the Table below.
2-3 Memory Installation
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
Insert the desired number of DIMMs into the memory slots, starting with
DIMM #1A. The memory scheme is interleaved, so you must install (a) pair(s)
of modules of the same type and same speed at a time, beginning with Bank
1, Bank 2 and so on. For optimal memory performance, please install two
modules at a time with the maximum of 4 modules as shown in the Table
below. (Refer to our website for additional memory information.)
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 incor-
rectly. Gently press down on the DIMM module until it snaps into place in the
slot. Repeat for all modules.
1.
2.
DIMM Modules Supported by CPUs
CPU
DIMM
FSB:
1600 MHz
FSB:
1333 MHz
FSB:
1066 MHz
800 MHz Supported Supported, but runs @ 667MHz Supported, but runs @ 667MHz
667 MHz Supported Supported Supported
533 MHz Not Supported Supported Supported
DIMM Installation for Optimized Performance
# of DIMMs Bank 1 Bank 2
2 DIMMs 1A 2A
4 DIMMs 1A 1B 2A 2B
Notes: i. DIMM slot# specified: DIMM slot to be populated; “---“: DIMM slot
not to be populated. ii. FBD 533 MHz, 667MHz and 800MHz 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. For optimal memory performance,
please install pairs of memory modules in both
Bank 1 and Bank 2. iv. For
memory to work properly, you need to follow the restrictions listed above.
