ARM Cortex-M4 at 100 MHz — what the core speed buys you
The STM32F411VEH6TR: The ARM Cortex-M4 core runs at 100 MHz.
Peripheral set and I/O — what connects where
81 I/O lines break out through the 100-UFBGA package, with connectivity covering I²C, SPI, UART/USART, USB OTG, and SDIO. That means you can hang a display, external Flash, a radio module, and a USB host on one chip without a companion interface mux. The 16-channel 12-bit ADC is enough for multi-sensor analog front-ends; if you need more resolution or simultaneous sampling, you budget an external ADC.