Users Guide

￭ Generally, higher fan speeds at idle and stress loads.
○ Minimum Power (Performance per Watt Optimized):
￭ Optimized for lowest system power consumption based on optimum fan power state.
￭ Generally, lower fan speeds at idle and stress loads.
○ Sound Cap — Sound Cap provides reduced acoustical output from a server at the expense of some performance.
Enabling Sound Cap may include temporary deployment or evaluation of a server in an occupied space, but it should
not be used during benchmarking or performance sensitive applications.
NOTE: Selecting Maximum Performance or Minimum Power, overrides thermal settings associated to System
Profile setting under System BIOS > System BIOS Settings.System Profile Settings page.
● Maximum Exhaust Temperature Limit — From the drop-down menu, select the maximum exhaust air temperature.
The values are displayed based on the system.
The default value is Default, 70°C (158 °F).
This option allows the system fans speeds to change such that the exhaust temperature does not exceed the selected
exhaust temperature limit. This cannot always be guaranteed under all system operating conditions due to dependency on
system load and system cooling capability.
● Fan Speed Offset — Selecting this option allows additional cooling to the server. In case hardware is added (example,
new PCIe cards), it may require additional cooling. A fan speed offset causes fan speeds to increase (by the offset %
value) over baseline fan speeds calculated by the Thermal Control algorithm. Possible values are:
○ Low Fan Speed — Drives fan speeds to a moderate fan speed.
○ Medium Fan Speed — Drives fan speeds close to medium.
○ High Fan Speed — Drives fan speeds close to full speed.
○ Max Fan Speed — Drives fan speeds to full speed.
○ Off — Fan speed offset is set to off. This is the default value. When set to off, the percentage does not display. The
default fan speed is applied with no offset. Conversely, the maximum setting will result in all fans running at maximum
speed.
The fan speed offset is dynamic and based on the system. The fan speed increase for each offset is displayed next to
each option.
The fan speed offset increases all fan speeds by the same percentage. Fan speeds may increase beyond the offset
speeds based on individual component cooling needs. The overall system power consumption is expected to increase.
Fan speed offset allows you to increase the system fan speed with four incremental steps. These steps are equally
divided between the typical baseline speed and the maximum speed of the server system fans. Some hardware
configurations results in higher baseline fan speeds, which results in offsets other than the maximum offset to achieve
maximum speed.
The most common usage scenario is non-standard PCIe adapter cooling. However, the feature can be used to increase
system cooling for other purposes.
● Thresholds
○ Maximum PCIe Inlet Temperature Limit — Default value is 55°C. Select the lower temperature of 45°C for third
party PCIe cards which require lower inlet temperature.
○ Exhaust Temperature Limits — By modifying the values for the following you can set the exhaust temperature
limits:
￭ Set Maximum Exhaust Temperature Limit
￭ Set Air Temperature Rise Limit
○ Minimum Fan Speed in PWM (% of Max) — Select this option to fine tune the fan speed. Using this option, you
can set a higher baseline system fan speed or increase the system fan speed if other custom fan speed options are
not resulting in the required higher fan speeds.
￭ Default — Sets minimum fan speed to default value as determined by the system cooling algorithm.
￭ Custom — Enter the percentage by which you want to change the fan speed. Range is between 9-100.
The allowable range for minimum fan speed PWM is dynamic based on the system configuration. The first value is
the idle speed and the second value is the configuration max (Depending on the system configuration, the maximum
speed may be up to 100%.).
System fans can run higher than this speed as per thermal requirements of the system but not lower than the defined
minimum speed. For example, setting Minimum Fan Speed at 35% limits the fan speed to never go lower than 35%
PWM.
NOTE: 0% PWM does not indicate fan is off. It is the lowest fan speed that the fan can achieve.
Setting up managed system 55