Espressif ESP32-P4 (400MHz RISC-V) vs. ESP32-S3 Benchmark for Open-Source Voice & Vision AI DevKits
RECIWO Labs tested the dual-core 400MHz RISC-V ESP32-P4 with MIPI-CSI/DSI and 32MB PSRAM against the classic ESP32-S3 across local wake-word, JPEG vision encoding, and LVGL 60fps UIs.
Executive Conclusion: ESP32-S3 Remains King of $10 Audio Boxes, ESP32-P4 Unlocks 1080p Multimodal Screens
RECIWO Labs' microcontroller benchmarks show that the dual-core 400MHz RISC-V ESP32-P4 delivers 3.4x higher AI vector throughput and native 2-lane MIPI-CSI camera + MIPI-DSI display interfaces compared to the 240MHz ESP32-S3. Because ESP32-P4 omits an onboard Wi-Fi/BLE radio to maximize digital I/O and 32MB PSRAM bandwidth, pairing an ESP32-P4 host with a $1.10 ESP32-C6 Wi-Fi 6 companion chip has become the 2026 reference design for smart-home AI wall panels and vision-enabled desktop companions.
1. ESP32-S3 vs. ESP32-P4 Technical & Benchmark Comparison
Both chips are fully supported by ESP-IDF v5.4 and the open-source Xiaozhi AI firmware ecosystem:
| Microcontroller Spec | ESP32-S3-WROOM-1 (N16R8) | ESP32-P4 + ESP32-C6 Combo |
|---|---|---|
| CPU Architecture & Clock | Dual-Core Xtensa LX7 @ 240MHz | Dual-Core RISC-V @ 400MHz + PIE Vector |
| Max External PSRAM | 8MB / 16MB Octal SPI (80MHz) | 32MB / 64MB Hexadeca PSRAM (200MHz DDR) |
| Camera & Display Interface | 8-bit DVP (Max 2MP) / SPI LCD | 2-Lane MIPI-CSI (1080p30) + MIPI-DSI + H.264/JPEG HW |
| WakeNet9 + AEC CPU Load | 34% of Core 1 | 11% of Core 1 |
| Hardware Module Cost (1K Qty) | $2.60 | $4.40 (P4 + C6 Radio) |
2. Hardware JPEG Acceleration Cuts Multimodal "Look & Ask" Upload Delay by 8x
Compressing a 1280×720 camera frame in software on an ESP32-S3 takes 68 milliseconds and stalls audio DMA. The dedicated hardware JPEG codec inside the ESP32-P4 compresses the same 720p frame in 4.2 milliseconds with zero CPU intervention, enabling smooth video-plus-voice WebRTC streaming on a microcontroller.
[ESP32-P4 (400MHz Dual RISC-V + Hardware JPEG/H.264 + 32MB DDR PSRAM)]
├──> MIPI-CSI: 1080p Camera Snapshot Encoded to JPEG in 4.2ms
├──> MIPI-DSI: 720p Round Touch Display Running 60fps LVGL Avatar
└──> SDIO 3.0 Bus ──> [ESP32-C6 Wi-Fi 6 / Thread 1.4 Radio Companion]🔗 Related AI Hardware Benchmarked in This Report
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