ESP32-P4: How to connect VDD_PSRAM_0, VDD_PSRAM_1 and VDDO_PSRAM?
In most applications, VDD_PSRAM_0 and VDD_PSRAM_1 should be connected together and connected to VDDO_PSRAM.
Connect 100nF and 1uF decoupling capacitors for VDD_PSRAM_0 and VDD_PSRAM_1 and place them as close as possible to the VDD_PSRAM_0 and VDD_PSRAM_1 pins.
UNDER NO CIRCUMSTANCES connect VDD_PSRAM_0 or VDD_PSRAM_1 to 3.3V or other voltage railes. These are 1.8V power pins with a voltage range of 1.65V to 1.95V.
Source: ESP32-P4 Hardware design guidelines
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