ESP32-P4 Explained: Espressif's High-Performance Vision MCU and When to Pair It With a C6 or S3
Espressif's ESP32 lineup has always been defined by one thing: a microcontroller with WiFi and Bluetooth built in. The ESP32-P4 breaks that pattern on purpose. It has no radio at all. Instead, Espressif built it to be the fastest, most I/O-rich chip in the family, aimed squarely at applications that need real horsepower for graphics, camera processing, or on-device machine learning — and it expects you to bolt on a second, small ESP32 chip when you need WiFi or Bluetooth. If you've been eyeing a project that involves a real display, a camera doing more than snapping the occasional JPEG, or USB-heavy I/O, the P4 is worth understanding before you default to an S3.
What's actually inside the P4
The ESP32-P4 runs on a dual-core RISC-V architecture clocked up to 400 MHz, backed by a separate low-power RISC-V core running around 40 MHz for background tasks and wake-on-event work while the main cores sleep. Both high-performance cores include a single-precision FPU and Espressif's AI instruction extensions, which matter if you're running any kind of on-device inference. On-chip SRAM is 768 KB, used as cache in front of external PSRAM on boards that need more working memory, plus a small block of zero-wait-state TCM RAM for latency-sensitive code.
The number that actually sells the chip for many projects is 55 programmable GPIOs — the most of any ESP32 variant — combined with dedicated high-speed interfaces: MIPI-CSI with an integrated image signal processor for camera input, MIPI-DSI for driving displays, parallel camera and display interfaces for boards that don't use MIPI, USB OTG 2.0 High-Speed, a full Ethernet MAC, SDIO 3.0 host, and hardware H.264 encoding at 1080p30. That combination — real camera ISP plus real display output plus enough CPU to do something with both at once — is what nothing else in the ESP32 family offers.
The catch: no radio, by design
The P4 has zero built-in WiFi or Bluetooth silicon. Espressif's intended architecture is a two-chip system: the P4 handles compute, camera, and display, while a companion ESP32-C6 or ESP32-S3 module handles wireless connectivity, talking to the P4 over SPI, SDIO, or UART using Espressif's ESP-Hosted or ESP-AT firmware stacks. This isn't a stopgap — it's the same pattern used in a lot of commercial products where a beefy applications processor pairs with a small radio co-processor, and it lets each chip do its job without compromise. Development boards like the ESP32-P4-EYE and ESP32-P4-Function-EV ship exactly this way, with a C6 module already wired up as the wireless side.
Practically, this means a P4 design is never a drop-in replacement for an S3 project that just needs "more power." Budget board space, a second set of firmware to maintain (ESP-Hosted running on the companion chip), and an extra few dollars of BOM cost for the second module.
ChipCPUBuilt-in radioBest for ESP32 (original)Dual-core Xtensa LX6WiFi + BT Classic/BLEGeneral IoT, legacy projects ESP32-S3Dual-core Xtensa LX7WiFi + BLEAI-accelerated IoT, USB, moderate camera work ESP32-C6Single-core RISC-VWiFi 6 + BLE + 802.15.4 (Zigbee/Thread)Low-power sensor nodes, Matter/Thread devices ESP32-P4Dual-core RISC-V @ 400MHz + LP coreNone — pairs with C6/S3Camera/vision, displays, high-throughput USB/EthernetWhen the P4 is the right call
Reach for a P4 when the project is genuinely bottlenecked on compute or I/O bandwidth rather than networking: a smart display running a real GUI framework like LVGL at high resolution, a camera doing on-device object detection instead of streaming raw frames to a server, a USB host device, or anything using Ethernet for reliability instead of WiFi. If your project is "read a sensor every few seconds and publish over WiFi," an S3 or even a plain ESP32 is simpler, cheaper, and has one fewer chip to debug. The P4's strength shows up specifically when the ESP32-CAM-class boards this site has covered before start running out of headroom — face detection with TensorFlow Lite, MIPI camera streams, or driving a MIPI-DSI panel are exactly the workloads that make the case for stepping up.
Getting started
ESP-IDF support for the P4 landed as a first-class target, so the toolchain and build flow will feel familiar if you've worked with an S3 or C3 before — idf.py set-target esp32p4 and the usual menuconfig/build/flash loop apply. Espressif's own ESP32-P4-EYE and ESP32-P4-Function-EV-Board are the fastest way to get real hardware with the camera and companion radio chip already wired correctly, which saves you from getting the MIPI or ESP-Hosted SPI wiring wrong on a first attempt. If you're building a custom board, budget real design time for the MIPI-CSI/DSI differential pairs — they're not as forgiving of sloppy layout as the single-ended GPIO most ESP32 projects use.
The P4 is a narrower tool than the S3 or C6 — it exists for one job, high-throughput vision and display work, and it does that job by giving up the thing every other ESP32 chip is known for. Understand that trade before you commit a board design to it, and it's a genuinely useful addition to the toolbox for projects that have outgrown what a camera-equipped S3 can do.