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Raspberry Pi

Raspberry Pi 4 Model B

Top / Raspberry Pi 4 Model B

2019/06/24

https://www.raspberrypi.org/products/raspberry-pi-4-model-b/

product brief

• https://datasheets.raspberrypi.com/rpi4/raspberry-pi-4-product-brief.pdf

リビジョン

• cat /proc/cpuinfo | grep Model
• Rev 1.5

製造

• OKdo
• element14

電源

• 5V 3A, type-C

スペック

• 1GB, 2GB, or 4GB of LPDDR4? SDRAM
• Full-throughput Gigabit Ethernet
• Dual-band 802.11ac wireless networking
• Bluetooth 5.0
• Two USB 3.0 and two USB 2.0 ports
• Dual monitor support, at resolutions up to 4K
• VideoCore VI graphics, supporting OpenGL ES 3.x
• 4Kp60 hardware decode of HEVC video
• Complete compatibility with earlier Raspberry Pi products
• 2×microHDMI ports (up to 4kp60 supported)

SoC

• BCM2711
  • A 1.5GHz quad-core 64-bit ARM Cortex-A72 CPU (~3× performance)

メモリ

• 最初は1,2,4
• 今は2,4,8

その他

• 2-lane MIPI DSI display port
• 2-lane MIPI CSI camera port

• H.265 (4Kp60 decode);
• H.264 (1080p60 decode, 1080p30 encode);
• OpenGL ES 3.0 graphics

OS

• Raspbian Buster

USB 3.0コントローラ

• VL805

買ったやつ

• 4GB

4K

• By default, when connected to a 4K monitor, the Raspberry Pi 4B, 400 and CM4 will select a 30Hz refresh rate. Use this option to allow selection of 60Hz refresh rates.
• hdmi_enable_4kp60

• It is not possible to output 4Kp60 on both micro HDMI ports simultaneously.
• Setting hdmi_enable_4kp60 will increase power consumption and the temperature of your Raspberry Pi.

8GBモデル

32bitOS

• only individual processes are limited to 3gb, the OS itself can use it all. We use LPAE for this.