1-4 Sun Fire X4450 Server Service Manual • November 2009
1.2.1 Infrastructure Boards
The Sun Fire X4450 server has the following boards installed in the chassis. The
boards are listed in
TABLE 1-2.
1.2.2 System Cables
The Sun Fire X4450 server internal cables are shown in FIGURE 1-1.
TABLE 1-2 Infrastructure Boards
Board Description Reference
Motherboard The motherboard includes CPU modules, a removable tray with
slots for 32 DIMMs, memory control subsystems, and the service
processor (lights out management (LOM)) subsystem.
The service processor (LOM) subsystem controls the host power
and monitors host system events (power and environmental).
The LOM controller draws power from the host’s 3.3V standby
supply rail, which is available whenever the system is receiving
AC input power, even when the system is turned off.
Section 4.8, “Servicing
the Motherboard
Assembly” on page 4-29
Power distribution
board
This board distributes main 12V power from the power supplies
to the rest of the system. It is directly connected to the paddle
card, and to the motherboard via a bus bar and ribbon cable. It
also supports a top cover interlock (“kill”) switch.
In the
Sun Fire X4450, the power supplies connect directly to the
power distribution board.
Section 5.5, “Servicing
the Power Distribution
Board (PDB)” on
page 5-12
Paddle card This board serves as the interconnect between the power
distribution board and the fan power boards, Drives backplane,
and I/O board.
Section 5.7, “Servicing
the Paddle Card” on
page 5-17
Fan power boards
(2)
These boards carry power to the system fan modules. In
addition, they contain fan module status LEDs, and transfer I
2
C
data for the fan modules.
Section 5.1, “Servicing
the Fan Power Boards”
on page 5-2
Drives backplane This board includes the connectors for the drives, as well as the
interconnect for the I/O board, Power and Locator buttons, and
system/component status LEDs. The
Sun Fire X4450 has an
eight-disk backplane. Each drive has an LED for power/activity,
fault, and ok-to-remove.
Section 5.3, “Servicing
the Drives Backplane”
on page 5-8
Front I/O board This board connects directly to the drives backplane. It is
packaged with the DVD drive as a single unit.
Section 3.5, “Servicing
the DVD/USB Module”
on page 3-21
PCIe risers There are three risers per system, each attached to the rear of the
motherboard. In the Sun Fire X4450 server, each riser supports
two PCIe cards.
Section 4.5, “Servicing
PCIe Risers” on
page 4-20
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