Supero Supero X7SBi, User Manual

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2-6
X7SBi User's Manual
2-4 Installing DDR2 Memory
Memory Module Installation
Exercise extreme care when installing or removing memory modules
to prevent any possible damage.
Support
The X7SBi supports up to 8 GB of Dual channel, unbuffered ECC/Non-ECC
DDR2 800/667 SDRAM in 4 DIMM slots. Both interleaved and non-inter-
leaved memory are supported, so you may populate any number of DIMM
slots. (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 :
1. Due to OS limitations, 8 GB memory might only show 4 GB of memory in certain
32-bit operating systems, such as Windows 32-bit XP and Windows 32-bit
Vista.
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 Table below.)
Possible System Memory Allocation & Availability
System Device Size Physical Memory
Remaining (-Available)
(4 GB Total System Memory)
Firmware Hub flash 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 specific to the Physical Ad -
dress Extension (PAE) mode
behavior which improves driver
compatibility. For more informa-
tion, please read the following
article at Microsoft’s Knowledge
Base website at: http://support.
microsoft.com/kb/888137.