This part is a kind of semiconductor called ADT7463.

Function of this product has dB COOL Remote Thermal Controller and Voltage Monitor.

Manufacturers : Analog Devices

Image and pinout :

Some of the text within the PDF file :

a FEATURES Monitors up to 5 Supply Voltages Controls and Monitors up to 4 Fan Speeds 1 On-Chip and 2 Remote Temperature Sensors Monitors up to 6 Processor VID Bits Dynamic TMIN Control Mode Optimizes System Acoustics Intelligently Automatic Fan Speed Control Mode Controls System Cooling Based on Measured Temperature Enhanced Acoustic Mode Dramatically Reduces User Perception of Changing Fan Speeds Thermal Protection Feature via THERM Output Monitors Performance Impact of Intel® Pentium® 4 Processor Thermal Control Circuit via THERM Input 2-Wire and 3-Wire Fan Speed Measurement Limit Comparison of All Monitored Values Meets SMBus 2.0 Electrical Specifications (Fully SMBus 1.1 Compliant) APPLICATIONS Low Acoustic Noise PCs Networking and Telecommunications Equipment dB [ ... ]

ADT7463 PDF Datasheet Download