Specifications

Intel® Server Board S3420GPRX TPS Functional Architecture

Revision 1.1

Intel order number E92065-001

3.2.5 Memory Subsystem Operating Frequency Determination

There are several limiting factors, including the number of DIMMs on a channel and

organization of the DIMM - that is, either single-rank (SR), dual-rank (DR), or quad-rank (QR):

 The speed of the processor’s IMC is the possible maximum speed.

 The speed of the slowest component – the slowest DIMM or the IMC – determines the

actual maximum frequency.

 A single 1333-MHz DIMM (SR or DR) on a channel may run at full 1333-MHz speed.

 If two SR/DR DIMMs are installed on a channel, the speed is limited to 1066 MHZ.

 A single QR RDIMM on a channel is limited to 1066 MHz.

 Two QR RDIMMs or a mix of QR + SR/DR on a channel is limited to 800 MHz.

3.2.6 Memory Subsystem Nomenclature

 The Intel

Xeon

3400 Series processor on the Intel

Server Board S3420GPRX has an

Integrated Memory Controller (IMC). The IMC provides two DDR3 channels and groups

DIMMs on the board into an autonomous memory.

 Intel

Server Board S3420GPRX can support a maximum of six DIMM sockets, three

DIMMs sockets per channel. The memory channels are identified as channels A, B.

 The DIMM identifiers on the silkscreen on the board provide information about the

channel and the processor socket to which they belong. For example, DIMM_A1 is the

first slot on channel A.

The following nomenclature is followed for DIMM sockets:

Table 3. Standard Platform DIMM Nomenclature

Channel A Channel B

A1 A2 A3 B1 B2 B3

Figure 11. S3420GPRX Memory DIMM location