Lenovo ThinkSystem ST550 Product Manual page 45

Fans and cooling
The server can operate in environments up to ASHRAE A4 (45°C and 90% humidity). Details and
restrictions are described in the
The server supports up to four simple-swap fans, three in the front of the server, just behind the drive bays
and one installed at the rear of the server. See the Inside view in the
for locations.
Use of these fans is as follows:
Single processor systems require 2 fans, installed in the area behind drive bays
The third fan installed behind the drive bays (part number is 7XH7A06781) is required if either:
The server has two processors
The server has four 2.5-inch hot-swap drives bays installed in place of the two 5.25-inch
media bays converted
Fan 4 (the fan at the rear of the server) can be installed as an N+1 redundant fan if desired. The part
number is 7XH7A05900.
If a GPU is installed, Fan 4 is required and is non-redundant in most configurations. The following
table indicates the cooling restrictions that apply when supported GPUs are installed:
Whether or not Fan 4 is redundant
Limits to ambient temperatures
Table 39. Cooling restrictions with GPUs installed
GPU configuration NVIDIA P2000 selected
One GPU installed Fan 4 is redundant
System is limited to ASHRAE A2 (35°C)
Two GPUs installed Fan 4 is non-redundant
System is limited to ASHRAE A2 (35°C)
The table below lists the fan upgrades.
Table 40. Fan upgrades
Part number Feature code
7XH7A06781 AVS3
7XH7A05900 AVS4
Lenovo ThinkSystem ST550 Server
Physical and electrical specifications
Description
ThinkSystem ST550 Front Mid Fan Module for 4x2.5" ODD conversion
ThinkSystem ST550 Rear Fan Module
section.
Components and connectors
NVIDIA P6000 selected
Fan 4 is non-redundant
System is limited to ASHRAE A2 (35°C)
Fan 4 is non-redundant
System is limited to 30°C ambient
section
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