Supermicro H8DGU User Manual page 27

Possible System Memory Allocation & Availability
System Device
Firmware Hub fl ash memory (System BIOS)
Local APIC
Area Reserved for the chipset
I/O APIC (4 Kbytes)
PCI Enumeration Area 1
PCI Express (256 MB)
PCI Enumeration Area 2 (if needed) -Aligned on 256-M
boundary-
VGA Memory
TSEG
Memory available for the OS & other applications
Size Physical Memory Available
(4 GB Total System
Memory)
1 MB 3.99 GB
4 KB 3.99 GB
2 MB 3.99 GB
4 KB 3.99 GB
256 MB 3.76 GB
256 MB 3.51 GB
512 MB 3.01 GB
16 MB 2.85 GB
1 MB 2.84 GB
2.84 GB
2-7
Chapter 2: Installation