想要的信息官网很全面:
Power
We ’ ve moved from USB micro-B to USB-C for our power connector. This supports an extra 500mA of current, ensuring we have a full 1.2A for downstream USB devices, even under heavy CPU load.
Ethernet and USB
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The Ethernet controller on the main SoC is connected to an external Broadcom PHY over a dedicated RGMII link, providing full throughput. USB is provided via an external VLI controller, connected over a single PCI Express Gen 2 lane, and providing a total of 4Gbps of bandwidth, shared between the four ports.
Raspberry Pi 4 on sale now from $35 - Raspberry Pi :
https://www.raspberrypi.org/blog/raspberry-pi-4-on-sale-now-from-35/关于新版 Raspbian Buster 新特性:
Buster - the new version of Raspbian - Raspberry Pi :
https://www.raspberrypi.org/blog/buster-the-new-version-of-raspbian/