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I'm pretty hyped with the big changes to USB and Ethernet:

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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.

The frustrating IO bottleneck where networking and USB shared a chip (and bandwidth) is finally gone.  The RPi 4 has a solid future capable little server.

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