ESP32 Forum

Hi all,

I just purchased a ESP-WROVER-KIT-VB boards, and just discovered the is only comes with 8MB of the 'PSRAM' on the board. That memory is accessed via the SPI bus, right? Are there any expansion modules available for the board which would provide a way to get more PSRAM, either via SPI or another method?

Jon

Sure you can get a psram chip and put it on another SPI bus but it wont be addressable as system memory which is limited to 4MB anyway, the rest is through himem api.

If the addressing is limited to 4mb, why do they ship the board with an 8mb part? Or is the extra 4mb only accessible using the himem library?

The 8MiB part is a better fit for the ESP32, electrically and protocol-wise; I think it is also better wrt manufacturability. You can indeed use the himem lib to access the upper 4MiB.