Core Freq RAM ROM $/10K DMIPS Atmel ATtiny85 Atmel AVR (8-bit) 20Mhz 0.5KB 8KB $0.78 Atmel ATmega328P Atmel AVR (8-bit) 20Mhz 2KB 32KB $1.54 ~7 Nordic nRF52 ARM Cortex M4F (32-bit) 64Mhz 64KB 512KB < $2.60 ~80 Espressif ESP8266EX Tensilica Xtensa LX106 (32-bit) 160Mhz 160KB 4MB (ext.) < $2.45 ~105 Intel Pentium (1994) Intel x86 (32-bit) 100Mhz N/A N/A ~169 NXP MK66 ARM Cortex M4 (32-bit) 180Mhz 256KB 1MB $10.95 ~225 Espressif ESP32 Tensilica Xtensa LX6 (32-bit; dual core) 240Mhz 520KB 4MB (ext.) < $4.39 ~600