The best thing about USB PD is that it could spell the end of the proprietary laptop power brick. With USB PD, you could connect your laptop to a monitor and send a 4K video to the display, while receiving a full power load from it.
USB 2.0, the most common connector for smartphones and tablets, usually caps out at about 2.5 watts, enough for small devices, but a far cry from the 20 to 65 watts that most laptops need at any given time. USB Power Delivery is a specification standard that allows devices to send or receive up to 100 watts of electricity over a single connection while transmitting data at the same time. MORE: USB 3.1 Demoed What is USB Power Delivery? However, all USB 3.1 connections promise improved data encoding that could lead to faster connections overall as well as increased power efficiency. According to the USB Implementer Forum, which is in charge of creating USB standards, USB 3.1 Gen 2 delivers the full 10 Gbps of throughput. The MacBook's connection is listed as "USB 3.1 Gen 1 (up to 5 Gbps)" so it caps out at the same maximum as USB 3.0. USB 3.1 connections are backward compatible with USB 3.0 and USB 2. In real-world testing of a first-generation USB 3.1 controller, Tom's Hardware got read and write speeds well over 700 MBps, nearly double the transfer rate of the same SSDs connected via USB 3.0. USB 3.1 is a new standard for high-speed data transmission that more than doubles the theoretical bandwidth of the USB 3.0, going from 5 Gbps to 10 Gbps. The MacBook spec sheet says its USB Type-C port is USB 3.1 (gen 1) compatible.
USB Type-C cables and ports may used for USB 3.1, but, depending on the host controller and devices, may only be compatible with USB 2.0 or USB 3.0.
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