IBM System x3550 M3 Type 4254 Problem Determination And Service Guide

v Five cooling fans (two, two, one for each thermal zone)
v One PCI riser-card assembly in PCI riser connector 2
The following illustration shows the locations of the power-supply LEDs on the ac
power supply.
The following table describes the problems that are indicated by various
combinations of the power-supply LEDs on an ac power supply and suggested
actions to correct the detected problems.
Chapter 3. Diagnostics 111

IBM System x3550 M3 Type 4254 Specifications

General

Processor	Intel Xeon 5600 series
Max Processors	2
Memory	Up to 192 GB DDR3
Form Factor	1U Rack
Chipset	Intel 5520
Drive Bays	Up to 4 hot-swap 2.5-inch SAS/SATA or SSD
RAID Support	RAID 0, 1, 10
Network Interface	Dual-port Gigabit Ethernet
Power Supply	460W or 675W
Expansion Slots	2 PCIe 2.0
Weight	Approximately 17.24 kg (38 lbs)
Memory Slots	18 (RDIMM) or 12 (UDIMM)