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Upgrade ESP32 board without psRAM with 4MB/8MB SPIRAM
ESP32 external psRAM module - MicroPython Forum (Archive)
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ESP32 enable and use external ram (SPI RAM / PSRAM)
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The ESP32 module, a close look at the brain of your dev kit
Available SRAM in ESP-WROOM32 - Development Platforms - PlatformIO Community
Hands-On: The RISC-V ESP32-C3 Will Be Your New ESP8266 | Hackaday
