Intel S975XBX2 - Workstation Board Motherboard, Specification, Page: 48 / 102

Intel Workstation Board S975XBX2 Technical Product Specification
48
the system memory map. All installed system memory can be used when there is no
overlap of system addresses.
Upper BIOS
area (64 KB)
Lower BIOS
area
(64 KB;
16 KB x 4)
Add-in Card
BIOS and
Buffer area
(128 KB;
16 KB x 8)
Standard PCI/
ISA Video
Memory (SMM
Memory)
128 KB
DOS area
(640 KB)
1 MB
960 KB
896 KB
768 KB
640 KB
0 KB
0FFFFFH
0F0000H
0EFFFFH
0E0000H
0DFFFFH
0C0000H
0BFFFFH
0A0000H
09FFFFH
00000H
FLASH
APIC
Reserved
0 MB
640 KB
1 MB
Top of usable
DRAM (memory
visible to the
operating system)
PCI Memory Range -
contains PCI, chipsets,
Direct Media Interface
(DMI), and ICH ranges
(approximately 750 MB)
DOS
Compatibility
Memory
DRAM
Range
OM18311
~20 MB
8 GB
Top of System Address Space
Upper
4 GB of
address
space
Figure 14. Detailed System Memory Address Map