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A+ SERVER 2042G-TRF/6RF User's Manual
DIMM Module Population Confi guration
For memory to work properly, follow the tables below for memory installation:
DIMM Type
Unbuffered
DIMM
Registered
DIMM
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
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
Per Channel DIMM Populations Options
DIMM A
DIMM B
SR or DR
Empty
SR
SR
DR
DR
SR or DR
Empty
SR
SR
DR
DR
QR
Empty
QR
QR
Max. MHz,
Max. MHz,
1.5V DIMMs
1.35V DIMMs
1333 MHz
1333 MHz
1333 MHz
1066 MHz
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
5-10
Max. GB/
Channel
1333 MHz
8 GB
1333 MHz
16 GB
1066 MHz
16 GB
800 MHz
32 GB
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