Pixhawk​®​ 4 features advanced processor technology from STMicroelectronics​®,​ sensor technology from Bosch®​​, InvenSense®​,​ and a NuttX real-time operating system, delivering incredible performance, flexibility, and reliability for controlling any autonomous vehicle.
The Pixhawk 4’s microcontroller has a 2MB flash memory and 512KB RAM. With the increased power and RAM resources, developers can be more productive and efficient with their development work. More complex algorithms and models can be implemented on the autopilot.
High-performance, low-noise IMUs on board are designed for stabilization applications. Data-ready signals from all sensors are routed to separate interrupt and timer capture pins on the autopilot, permitting precise time-stamping of sensor data. Newly designed vibration isolations enables more accurate readings, allowing vehicles to reach better overall flight performances.
The two external SPI buses and six associated chip select lines allow to add additional sensors and SPI-interfaced payload. There are total of four I2C buses, two dedicated for external use and two grouped with serial ports for GPS/Compass modules.
Technical Specifications 
Main FMU Processor
STM32F765 - 32 Bit Arm ® Cortex® -M7, 216MHz, 2MB memory, 512KB RAM
IO Processor
STM32F103 - 32 Bit Arm® Cortex®-M3, 72MHz, 64KB SRAM (Current)
STM32F100 - 32 Bit Arm ® Cortex® -M3, 24MHz, 8KB SRAM (Discontinued)
 On-board sensors
Accel/Gyro: ICM-20689
Accel/Gyro: BMI055/ICM-20602
Mag: IST8310
Barometer: MS5611 
Electrical Data
Power module output: 4.9~5.5V
Max input voltage: 6V
Max current sensing: 120A
USB Power Input: 4.75~5.25V
Servo Rail Input: 0~36V
Operating Temperature: -25-85°C
Mechanical Data
Dimensions: 44x84x12mm
Weight(plastic case): 33.3g
Weight(aluminum case): 49g
M10 gps:
The M10 GPS uses multi-constellation GNSS powered by u-blox M10 series, a concurrent GNSS receiver which can receive and track multiple GNSS systems. Owing to the multi-band RF front-end architecture all four major GNSS constellations, GPS,Galileo, GLONASS and BeiDou can be received concurrently.
It also comes with the IST8310 compass, tricolored LED indicator, buzzer, and a safety switch. There are 3 different connectors options for different purposes. This module ships with a baud rate of 115200 5Hz.
The high-gain 25 x 25 mm patch antenna provides excellent performance and the omnidirectional antenna radiation pattern increases flexibility for device installation. It features active circuitry for the ceramic patch antenna, rechargeable backup battery for warm starts. 
High-Speed Drone GPS Comparison
This blog post put Holybro M10, M9N, F9P and Matek M10Q was put to an ultimate test to determine which GPS units could keep pace with a high-speed drone in acro mode while ensuring precision during RTL and autonomous missions.
Features
Newest Ublox 10th Gen GNSS
Fast & Accurate Positioning
High-gain 25*25*4mm antenna
IST8310 Compass
Internal Buzzer, Safety switch
Ultra Bright UI RGB LED
Included 
Pixhawk 4 Flight Controller 
Power Module: PM02 V3 6s-12S
GPS: M10
Cable Set