Справочник Пользователя для Intel Server Board S5500HCV S5500HCVR

With the platform running in Performance mode (Default), several platform control algorithm 
variables are set to enhance the platform’s capability of operating at maximum performance 
targets for the given system. In doing so, the platform is programmed with higher fan speeds at 
lower ambient temperatures. This results in a louder acoustic level than is targeted for the given 
platform, but the increased airflow of this operating mode greatly reduces both possible memory 
throttling from occurring and dynamic fan speed changes based on processor utilization. 

With the platform running in Acoustics mode, several platform control algorithm variables are set 
to ensure acoustic targets are not exceeded for specified Intel platforms. In this mode, the 
platform is programmed to set the fans at lower speeds when the processor does not require 
additional cooling due to high utilization / power consumption. Memory throttling is used to 
ensure memory thermal limits are not exceeded.  

: Fan speed control for a non-Intel chassis, as configured after running the FRUSDR utility 

and selecting the Non-Intel Chassis option, is limited to only the CPU fans. The BMC only 
requires the processor thermal sensor data to determine how fast to operate these fans. The 
remaining system fans will operate at 100% operating limits due to unknown variables 
associated with the given chassis and its fans. Therefore, regardless of whether the system is 
configured for Performance Mode or Acoustics Mode, the system fans will always run at 100% 
operating levels providing for maximum airflow. In this scenario, the Performance and Acoustic 
mode settings only affect the allowable performance of the memory (higher BW for the 
Performance mode).