Surprisingly difficult to understand!What is the difference between USB-C, USB4, Thunderbolt (4)?

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Let's take a look at "Check the Mac port"

When you access the Apple's support page "Examine Mac Ports", the type of port and the Mac model equipped with it are listed.The types of ports are "Thunderbolt 4 (USB-C)" and "Thunderbolt/USB4", and below it is "Thunderbolt 3".It seems that this notation alone will be worried about what is different.

What is Thunderbolt?

まずThunderboltですが、これはAppleとIntelが共同開発した高速汎用データ伝送技術で、パソコンとディスプレイや外付けドライブなどの周辺機器を接続するための通信規格です。2011年2月に発表されたMacBook Proではじめて採用されました。 Thunderbolt 2まではUSB Type-C（以下USB-C）とはコネクタ形状が全く異なっていました。 それが2015年に登場したThunderbolt 3規格からは、コネクタにUSB-Cを採用するようになります。つまりコネクタ形状はUSB-Cとまったく同じ、ということです。

Thunderbolt 3/Thunderbolt 4 and USB-C are not the same

ではThunderbolt 3/Thunderbolt 4とUSB-Cは同じかというと、これがそうではないのです。 USB-Cを採用している製品には、USB 3.1、USB PDなど様々な規格に対応しているものがありますが、これらがThunderbolt 3/Thunderbolt 4にも対応しているとは限らないからです。 話が複雑になるので今回はケーブルについては説明を省略しますが、「Thunderbolt 3以降はUSB-Cと同じコネクタ形状だが同一ではない」ということは覚えておいてください。

The difference between "Thunderbolt 4 (USB-C)" and "Thunderbolt/USB4"

Here's the story back to the Apple's support page, "Check the Mac port". What is different between "Thunderbolt 4 (USB-C)" and "Thunderbolt/USB4"? As mentioned above, both have the same connector shape. However, while the minimum requirement of the USB4 video output is one screen, Thunderbolt 4 has a minimum of 2 screens (and 4K), the minimum requirements for PCIe transmission are not particularly USB4, while Thunderbolt 4 is 32Gbps, and USB4. USB PD charging support is not included in the requirements, but it is essential in Thunderbolt 4. For the differences between Thunderbolt 3 and Thunderbolt 4, please refer to the past article that summarizes the differences between the two, "The Transfer speed is faster than" 3 "". In other words, IMAC (24 inches, 24 inches, "MacBook Pro (14 inch, 2021), MacBook Pro (16 inches, 2021), and" Thunderbolt/USB4 "port with" Thunderbolt 4 (USB-C) "port. M1, 2021), MacBook Pro (13 inches, M1, 2020), MacBook Air (M1, 2020), and Mac Mini (M1, 2020) are slightly different in connection with peripheral devices, including the number of screens that can be output. There is.

It is convenient to have a 4 cable of Thunderbolt

Finally, for those who have a Mac or iPad and want to buy a USB-C cable.If you want to buy a new one, we recommend purchasing a 4 cable of Thunderbolt.It is compatible with not only Thunderbolt 3 but also USB4 (and earlier USB standard).Photo: Intel (LUNATIC)

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