User`s manual

2-6
X6DH8-G2/X6DHE-G2 User's Manual
2-3 Installing DIMMs
Note: Check the Supermicro web site for recommended memory modules:
http://www.supermicro.com/support/faqs/.
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. The memory scheme is interleaved so you must install two
modules at a time, beginning with Bank 1, then Bank 2, and so on.
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 X6DH8-G2/X6DHE-G2 supports up to 16 GB of Registered ECC DDR2-
400 (PC3200) memory. All motherboards were designed to support 2 GB
modules in each slot, but has only been verified for up to 1 GB modules.
Note: Due to memory allocation to devices installed in the system, the re-
maining memory available for operational use may be reduced when 4 GB
(or more) of memory is used. The reduction of memory availability is dispro-
portional. See the table below for reference.
Possible System Memory Allocation & Availability
System Device Size Physical Memory Available
(4 GB Total Memory)
Firmware Hub Flash
Memory (BIOS)
1MB 3.99GB
Local APIC 4KB 3.99 GB
Area reserved for the
chipsets
2MB 3.99 GB
I/O APIC (4 Kbytes) 4KB 3.99 GB
PCI Enumeration Area 1 256MB 3.76 GB
PCI Express (256MB) 256MB 3.51 GB
PCI Enumeration Area 2
(if needed)-aligned on
256MB boundary
512MB 3.01 GB
VGA Memory 16MB 2.85 GB
TSEG 1MB 2.84 GB
Memory available to the
OS & other applications
2.84 GB