Feather M4 vs ESP32
Cortex-M4F (SAMD51) at 120 MHz against Xtensa LX6 (ESP32) at 240 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 Feather M4
2.74×
double divide
Biggest win for ESP32
2.60×
double modulo
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 Feather M4 is than ESP32, operations per second. Blue: Feather M4 ahead. Orange: ESP32 ahead.
| Add | Subtract | Multiply | Divide | Modulo | |
|---|---|---|---|---|---|
| uint8_t | 1/1.27× 8.98 M/s · 11.4 M/s | 1/1.27× 8.98 M/s · 11.4 M/s | 1/1.27× 8.98 M/s · 11.4 M/s | 1/1.49× 7.01 M/s · 10.4 M/s | 1/1.57× 6.36 M/s · 10 M/s |
| uint16_t | 1/1.27× 8.98 M/s · 11.4 M/s | 1/1.27× 8.98 M/s · 11.4 M/s | 1/1.27× 8.98 M/s · 11.4 M/s | 1/1.52× 6.12 M/s · 9.32 M/s | 1/1.67× 5.36 M/s · 8.97 M/s |
| uint32_t | 1/1.24× 9.71 M/s · 12 M/s | 1/1.24× 9.71 M/s · 12 M/s | 1/1.24× 9.71 M/s · 12 M/s | 1/1.53× 6.53 M/s · 10 M/s | 1/1.55× 6.19 M/s · 9.6 M/s |
| uint64_t | 1/1.14× 6.19 M/s · 7.05 M/s | 1/1.12× 6.19 M/s · 6.94 M/s | 1.17× 5.61 M/s · 4.79 M/s | 1/1.98× 885 k/s · 1.75 M/s | 1/1.91× 885 k/s · 1.69 M/s |
| float | 1/1.34× 8.98 M/s · 12 M/s | 1/1.34× 8.98 M/s · 12 M/s | 1/1.34× 8.98 M/s · 12 M/s | 1.24× 4.73 M/s · 3.8 M/s | 1/2.00× 866 k/s · 1.73 M/s |
| double | 1/2.47× 1.2 M/s · 2.96 M/s | 1/2.25× 1.19 M/s · 2.68 M/s | 1/1.09× 1.7 M/s · 1.86 M/s | 2.74× 1.26 M/s · 459 k/s | 1/2.60× 425 k/s · 1.11 M/s |