Chapter 5: Advanced Serverboard Setup
Note 1: Due to OS limitations, some operating systems may not show more than 4 GB of memory.
Note 2: Due to memory allocation to system devices, the amount of memory that remains available for operational use will be reduced when 4 GB of RAM is used. The reduction in memory availability is disproportional.
Possible System Memory Allocation & Availability
System Device | Size | Physical Memory Available |
|
| (4 GB Total System Memory) |
|
|
|
Firmware Hub flash memory (System BIOS) | 1 MB | 3.99 GB |
|
|
|
Local APIC | 4 KB | 3.99 GB |
|
|
|
Area Reserved for the chipset | 2 MB | 3.99 GB |
|
|
|
I/O APIC (4 Kbytes) | 4 KB | 3.99 GB |
|
|
|
PCI Enumeration Area 1 | 256 MB | 3.76 GB |
|
|
|
PCI Express (256 MB) | 256 MB | 3.51 GB |
|
|
|
PCI Enumeration Area 2 (if needed) - aligned on | 512 MB | 3.01 GB |
256 MB boundary |
|
|
|
|
|
VGA Memory | 16 MB | 2.85 GB |
|
|
|
TSEG | 1 MB | 2.84 GB |
|
|
|
Memory available for the OS & other applications |
| 2.84 GB |
|
|
|