Processor Overview; Memory Boards - Intel SR870BN4 - Server Platform - 0 MB RAM Product Manual

Processor Overview

Each Intel Itanium 2 processor plugs into a 700-pin Zero Insertion Force (ZIF) socket. Each
processor is powered by a 48 V power pod located adjacent to the processor on the processor board.
Attached to the top of each processor is a heat sink that dissipates thermal energy.
CAUTION
When shipping, unpacking, or handling Intel Itanium 2 processors, be sure to
follow the guidelines described in "Handling the Intel Itanium 2 Processors"
on page 211.

Memory Boards

The processor board is designed to support two memory boards (both of which must be installed for
the system to operate). The memory boards are installed on the primary and secondary side of the
processor board assembly as shown in Figure 84 on page 206.
The main components of the memory boards are shown in Figure 98 on page 222 and described as
follows:
Eight 184-pin, DDR-SDRAM DIMM sockets support up to 16 GB of memory using eight
2 GB DIMMs per memory board for a total of 32 GB per system using -4XX revision memory
boards, or up to 32 GB of memory using eight 4 GB DIMMs per memory board for a total of
64 GB per system using -5XX revision memory boards.
Two DMH (DDR Memory Hub) components of the E8870 chip set. This allows two Rambus
channels from the E8870-memory controller (SNC-M) to be extended to four DDR channels on
the memory boards. The Rambus channel supports 400 MHz operation and the DDR channels
support 100 MHz operation.
An integrated 2.5 V to 1.25 V DC-to-DC converter provides voltage for DDR signal
termination.
I2C logic.
Field Replaceable Unit (FRU) device ID accessed through a private I2C bus.
Voltage/temperature sensors.
DIMMs must be installed on a memory board in groups of four (a group of four constitutes a row)
as shown in Installing DIMMs on page 223.
CAUTION
DIMMs should only be installed, removed, or replaced by a technically
qualified person.
CAUTION
The system does not support mixed-sized DIMMs or DIMMs from different
vendors within the same row.
NOTE
The BIOS automatically detects, sizes, and initializes the memory array,
depending on the type, size, and speed of the installed DIMMs. The BIOS
Intel® SR870BN4 Server System Product Guide 37