User's Manual

5-10
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:
Per Channel DIMM Populations Options
DIMM Type DIMM A DIMM B Max. MHz,
1.5V DIMMs
Max. MHz,
1.35V DIMMs
Max. GB/
Channel
Unbuffered
DIMM
SR or DR Empty
1333 MHz 1333 MHz 8 GBSR SR
DR DR
Registered
DIMM
SR or DR Empty
1333 MHz 1333 MHz 16 GBSR SR
DR DR
QR Empty 1333 MHz 1066 MHz 16 GB
QR QR 1066 MHz 800 MHz 32 GB
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 fl ash 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 256-M
boundary-
512 MB 3.01 GB
VGA Memory 16 MB 2.85 GB
TSEG 1 MB 2.84 GB
Memory available for the OS & other applications 2.84 GB