: Unlike previous models, the Pi 4 supports up to 8GB of RAM. The memory is interfaced directly with the BCM2711 via a dedicated high-speed bus. VideoCore VI GPU
: The Pi 4 lacks the polyfuse found on older models, meaning users must ensure their power supply does not exceed the recommended 5.25V. High-Speed I/O and Connectivity Raspberry Pi 4 Model B Full Schematic
: Supports OpenGL ES 3.1 and Vulkan 1.0, enabling dual 4K display output. Power Management Unit (PMU) : Unlike previous models, the Pi 4 supports up to 8GB of RAM
: Power is typically supplied via a USB-C connector. The official schematic shows the CC1 and CC2 lines used for power negotiation. Early revisions (v1.1) had a known design flaw in this circuit where they shared a single pull-down resistor, which was corrected in revision 1.2 . High-Speed I/O and Connectivity : Supports OpenGL ES 3
Understanding the hardware architecture of the Raspberry Pi 4 Model B Go to product viewer dialog for this item.
The schematic reveals how the Pi 4 achieves its massive leap in I/O performance over the Pi 3B+: Raspberry Pi 4 Model B specifications
includes four synchronous buck converters that regulate the input 5V down to various rail voltages required by the SoC, including VDD_CORE (roughly 1.0V), 1V8 , and 1V1_DDR .