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Teensy 4.0 is simply the most powerful platform of the Arduino environment : 

• ARM Cortex-M7 at 600 MHz with a 32 and 64 bits FPU
• 2MBytes Flash, 1 MBytes RAM, 4K EEPROM (emulated)
• 2 USB ports, both 480 MBit/sec
• 7 Serial ports, 3 SPI, 3 I2C
• 3 CAN Bus (1 with CAN FD)
• 2 I2S Digital Audio, 1 S/PDIF Digital Audio
• 1 SDIO (4 bit) native SD
• 32 general purpose DMA channels
• 31 PWM pins
• 40 digital I/Os, all interrrupt capable, with 24 accessible on pins
• 14 analog inputs / 2 ADCs
• Cryptographic Acceleration, Random Number Generator
• RTC for date/time
• Pixel Processing Pipeline
• Power On/Off management

Teensy 4.0 maintains the same form-factor as Teensy 3.2, with most pins offering similar peripheral features.