The final component out of the headset is the Oculus Tracker V2 board, custom designed and optimized for a 1000 Hz refresh rate.

Here we find the chips controlling the revolutionary head-tracking device:

STMicroelectronics 32F103C8 ARM Cortex-M3 microcontroller with 72 MHz CPU

Invensense MPU-6000 six-axis (gyro + accelerometer) motion tracking controller

Honeywell HMC5983 three-axis digital compass, probably used in conjunction with the accelerometer to correct for gyroscope drift

The back of the sensor board is covered in shiny contact points, presumably for easily testing each board in a spring contact rig.