Intel DG33BU specifications Detailed System Memory Address Map

Intel Desktop Board DG33BU Technical Product Specification

The amount of installed memory that can be used will vary based on add-in cards and BIOS settings. Figure 8 shows a schematic of the system memory map. All installed system memory can be used when there is no overlap of system addresses.

8 GB

Top of System Address Space

PCI Memory Range - contains PCI, chipsets, Direct Media Interface (DMI), and ICH ranges (approximately 750 MB)

DRAM

Range

DOS

Compatibility

Memory

FLASH

APIC

Reserved

Upper

4 GB of address space

~20 MB

Top of usable DRAM (memory visible to the operating system)

1MB 640 KB

0FFFFFH

0F0000H

0EFFFFH

0E0000H

0DFFFFH

0C0000H

0BFFFFH

0A0000H

09FFFFH

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)

1MB

960 KB

896KB

768KB

640 KB

0 MB

00000H

0 KB

OM18311

Figure 8. Detailed System Memory Address Map

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