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A+ Server 1012A-MRF User's Manual
Memory Population for Optimal Performance
# DIMMS
2 DIMMs
4 DIMMs
DIMM Module Population Configuration
For memory to work properly, follow the tables below for memory installation:
DIMM Type
UDIMM
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 flash 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 MB boundary-
VGA Memory
TSEG
Memory available for the OS & other applications
Channel 1
DIMM1A
DIMM1A
Per Channel DIMM Populations Options
DIMM A
DIMM B
SR or DR
Empty
SR
SR
DR
DR
DIMM2A
DIMM2B
DIMM2A
Max. MHz,
1.5V DIMMs
1.35V DIMMs
1600 MHz
1600 MHz
1333 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
5-6
Channel 2
DIMM2B
Max. MHz,
Max. GB/
Channel
1333 MHz
8 GB
1333 MHz
4 GB
1066 MHz
16 GB
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