User`s manual
2-6
X7SBA User's Manual
2-4 Installing DDR2 Memory
Memory Module Installation (See Figure 2-1)
Exercise extreme care when installing or removing memory modules
to prevent any possible damage.
Support
The X7SBA supports up to 8 GB of Dual channel, unbuffered ECC DDR2
800/667 SDRAM in 4 DIMM slots. Both interleaved and non-interleaved
memory are supported, so you may populate any number of DIMM slots.
Note: Populating DIMM#1A,DIMM#2A, and/or DIMM#1B, DIMM#2B with
memory modules of the same size and of the same type will result in dual
channel, two-way interleaved memory which is faster than the single chan-
nel, non-interleaved memory. When ECC memory is used, it may take 25-40
seconds for the VGA to display.
Notes:
Due to chipset limitation, 8GB Memory can only be supported by the fol-1.
lowing operating systems: 32-Bit: Windows 2000 Advanced Server/2003
Enterprise; 64-Bit: Windows Server 2003 Standard/Enterprise/Windows XP
Professional x64 Edition.
Some old-version of DDR2-667 may not match Intel's On-Die-Temperature 2.
requirement and will automatically be down-graded to run @ 533 MHz, If this
occurs, contact your memory vendor to check the ODT value.
Due to memory allocation to system devices, memory remaining available 3.
for operational use will be reduced when 4 GB of RAM is used. The reduction
in memory availability is disproportional. (Refer to the Table below.)
Possible System Memory Allocation & Availability
System Device Size Physical Memory
Remaining (-Available)
(4 GB Total System Memory)
Firmware Hub ash memory
(System BIOS)
1 MB 3.99
Local APIC 4 KB 3.99
Area Reserved for the chipset 2 MB 3.99
I/O APIC (4 Kbytes) 4 KB 3.99
PCI Enumeration Area 1 256 MB 3.76
PCI Express (256 MB) 256 MB 3.51
PCI Enumeration Area 2 (if
needed) -Aligned on 256-MB
boundary-
512 MB 3.01
VGA Memory 16 MB 2.85
TSEG 1 MB 2.84
Memory available to OS and
other applications
2.84
Note to Microsoft Users:
Microsoft implemented a de-
sign change in Windows XP
with Service Pack 2 (SP2) and
Windows Vista. This change
is specic to the Physical Ad-
dress Extension (PAE) mode
behavi o r which impro ves
driver compatibility. For more
information, please read the
following article at Microsoft’s
Knowledge Base website at:
http://support.microsoft.com/
kb/888137.