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DIMM Module Population Configuration
For memory to work properly, follow the tables below for memory installation:
DIMM Type
DIMM A
SR or DR
Unbuffered
SR
DIMM
DR
SR or DR
SR
Registered
DR
DIMM
QR
QR
QR
LRDIMM
QR
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-M
boundary-
VGA Memory
TSEG
Memory available for the OS & other applications
Per Channel DIMM Populations Options
DIMM B
Empty
SR
DR
Empty
SR
DR
Empty
QR
Empty
QR
5-9
Chapter 5: Advanced Serverboard Setup
Max. MHz,
Max. MHz,
1.5V DIMMs
1.35V DIMMs
1600 MHz
1600 MHz
1333 MHz
1333 MHz
1600 MHz
1600 MHz
1333 MHz
1600 MHz
1333 MHz
1066 MHz
1066 MHz
800 MHz
1333 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
Max. GB/
Channel
8 GB
8 GB
16 GB
16 GB
16 GB
32 GB
16 GB
32 GB
32 GB
64 GB
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