User`s manual

Chapter 5: Advanced Serverboard Setup

5-11

DIMM Module Population Conﬁ guration

For memory to work properly, follow the tables below for memory installation:

DIMM Population Table

DIMM

Slots per

Channel

DIMMs

Populated

per

Channel

DIMM Type (Reg.=

Registered)

Speeds (in MHz) Ranks per

DIMM (any

combination;

SR=Single Rank,

DR=Dual Rank,

QR=Quad Rank)

2 1 Reg. DDR3 ECC 800,1066,1333 SR or DR

2 1 Reg. DDR3 ECC 800,1066 QR

2 2 Reg. DDR3 ECC 800,1066 Mixing SR, DR

2 2 Reg. DDR3 ECC 800 Mixing SR, DR,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 mem-

ory 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