ESP32 vs Feather M4
Xtensa LX6 (ESP32) at 240 MHz against Cortex-M4F (SAMD51) at 120 MHz, on real hardware, same C kernels, clocks verified.
Feather M4
Cortex-M4F (SAMD51)
- Family
- Arm Cortex-M
- Board
- Feather M4 Express
- Clock
- 120 MHz
- float / double
- 32-bit / 64-bit
Typical gap
1.36×
ESP32 faster, geometric mean of 30 cells
Biggest win for ESP32
2.60×
double modulo
Biggest win for Feather M4
2.74×
double divide
Clock for clock
1.47×
Feather M4 needs fewer cycles per op (2.00× clock gap)
Operation by operation
Every cell
How many times faster ESP32 is than Feather M4, operations per second. Blue: ESP32 ahead. Orange: Feather M4 ahead.
| Add | Subtract | Multiply | Divide | Modulo | |
|---|---|---|---|---|---|
| uint8_t | 1.27× 11.4 M/s · 8.98 M/s | 1.27× 11.4 M/s · 8.98 M/s | 1.27× 11.4 M/s · 8.98 M/s | 1.49× 10.4 M/s · 7.01 M/s | 1.57× 10 M/s · 6.36 M/s |
| uint16_t | 1.27× 11.4 M/s · 8.98 M/s | 1.27× 11.4 M/s · 8.98 M/s | 1.27× 11.4 M/s · 8.98 M/s | 1.52× 9.32 M/s · 6.12 M/s | 1.67× 8.97 M/s · 5.36 M/s |
| uint32_t | 1.24× 12 M/s · 9.71 M/s | 1.24× 12 M/s · 9.71 M/s | 1.24× 12 M/s · 9.71 M/s | 1.53× 10 M/s · 6.53 M/s | 1.55× 9.6 M/s · 6.19 M/s |
| uint64_t | 1.14× 7.05 M/s · 6.19 M/s | 1.12× 6.94 M/s · 6.19 M/s | 1/1.17× 4.79 M/s · 5.61 M/s | 1.98× 1.75 M/s · 885 k/s | 1.91× 1.69 M/s · 885 k/s |
| float | 1.34× 12 M/s · 8.98 M/s | 1.34× 12 M/s · 8.98 M/s | 1.34× 12 M/s · 8.98 M/s | 1/1.24× 3.8 M/s · 4.73 M/s | 2.00× 1.73 M/s · 866 k/s |
| double | 2.47× 2.96 M/s · 1.2 M/s | 2.25× 2.68 M/s · 1.19 M/s | 1.09× 1.86 M/s · 1.7 M/s | 1/2.74× 459 k/s · 1.26 M/s | 2.60× 1.11 M/s · 425 k/s |