This part is a kind of semiconductor called ISL95831.

Function of this product has 3+1 Voltage Regulator.

Manufacturers : Intersil

Image and pinout :

Some of the text within the PDF file :

3+1 Voltage Regulator for IMVP-7/VR12™ CPUs ISL95831 Compliant with IMVP-7/VR12™, the ISL95831 provides a complete solution for microprocessor and graphic processor core power supply. It provides two Voltage Regulators (VRs) with three integrated gate drivers. The first VR can be configured as 3-, 2- or 1-phase VR while the second output is 1phase VR, providing maximum flexibility. The two VRs share the serial control bus to communicate with the CPU and achieve lower cost and smaller board area compared with the two-chip approach. Based on Intersil’s Robust Ripple Regulator (R3) technology™, the PWM modulator compared to traditional modulators, has faster transient settling time, variable switching frequency during load transients and has improved light load efficiency with it’s [ ... ]

ISL95831 PDF Datasheet Download