Mac上的USB-C端口可能看起来都一样，但有时它们的构建方式不同。特别是USB-C(USB-C)端口具有不同的数据传输速度和供电速率。如果您的Mac有不同的 USB-C(USB-C)端口，您可能会发现其中一个端口传输数据（或为手机充电）的速度比其他端口快。
在本指南中，我们将向您展示如何检查USB-C端口的规格以及如何识别Mac上最快的(Mac)USB端口。
USB-C 与Thunderbolt USB-C：有什么不同(Different)
Apple使用MacBook上的常规(MacBooks)USB-C和Thunderbolt USB-C端口。如前所述，这些连接接口可以有不同的配置。但由于它们看起来相同，通常很难区分哪个USB-C端口是常规端口，哪个使用Thunderbolt标准。
一些笔记本电脑制造商通过使用“闪电”图标标记Thunderbolt端口来区分这两个接口。另一方面，常规USB-C端口通常带有(USB-C)USB标签。虽然，一些制造商也没有标记USB-C端口。(USB-C)
Apple不会在新一代MacBook(MacBooks)上标记端口，因此仅通过视觉检查几乎不可能区分USB-C端口。(USB-C)在下一部分中，我们将向您展示如何识别 Mac 的USB-C端口及其数据传输速度。
如果您不熟悉整个USB-C与Thunderbolt USB-C 的(Thunderbolt USB-C)讨论，或者您想了解它们之间的差异，请查看对 Thunderbolt 标准的深入报道(in-depth coverage of the Thunderbolt standard)。
您的 Mac 有哪些端口？
当您购买新的Mac时，您应该会在包装上的规格表上看到端口配置。某些MacBook型号的屏幕尺寸、生产年份和端口配置也会以产品名称为后缀。因此，当您看到“ MacBook Pro 13 英寸（四个雷雳 3(Thunderbolt 3)端口，2020 年）”时，它会告诉您Mac上的端口类型和数量。
但是，如果您处理掉了Mac的包装怎么办？或者，您的Mac的型号名称中没有端口规格？Apple有一个专门的资源页面，可以帮助您识别 Mac 上的端口(identify the ports on your Mac)。或者，查看您的MacBook型号的在线用户手册或规格。
单击菜单栏上的Apple 徽标(Apple Logo)并转到About This Mac > Support并选择User Manual或Specifications。这将打开一个新的浏览器窗口并将您重定向到一个网页，您可以在其中检查 Mac 的端口配置。
如何在 Mac 上检查 USB-C 速度
macOS 有一个内置工具，可让您检查 Mac 的硬件、软件和网络组件的状态。
按照以下步骤使用 macOS系统信息(System Information)工具检查连接到 USB-C 端口的设备的速度。这将使您了解Mac上哪个端口最快。
1. 按住Option键并单击菜单栏上的Apple 标志。(Apple logo)
2. 不松开Option键，选择System Information。
访问系统信息(System Information)工具的另一种方法是单击Apple 徽标(Apple logo)，选择关于本机(About This Mac)，然后单击概览选项卡中的系统报告(System Report)。
3. 展开硬件(Hardware)部分。
4.向下滚动(Scroll)左侧边栏并单击USB。
在USB 设备树(USB Device Tree)部分，您会发现Mac的USB-C端口根据其版本列出。您还可以找到有关连接到Mac的(Mac)USB设备的详细信息。
将设备插入任何端口并单击设备名称以检查设备或端口的速度。对其他端口重复这些步骤以检查其速度。
注意：(Note:)如果您的设备未出现在USB 设备树上(USB Device Tree)，请关闭并重新打开系统信息(System Information)窗口，然后再次检查。
如果左侧栏中有Thunderbolt选项，则意味着Mac上的部分（或全部）端口支持Thunderbolt标准。
选择左侧边栏中的Thunderbolt并检查列表中端口和设备的(Thunderbolt)速度(Speed)部分。
USB-C 速度及其含义
USB 设备树(USB Device Tree)页面上的速度信息告诉您Mac的USB-C端口的版本和规格。这些可以帮助您找到Mac上最快的(Mac)USB-C端口。这就是他们的意思：
1.Up to 1.5 Mb/sec:具有此速度的 USB-C 端口或设备表示USB 1连接类型。
2.Up to 12 Mb/sec:USB 1.1功能的端口和设备具有此速度。
3.Up to 480 Mb/sec:这告诉您USB-C设备或端口支持USB 2.0速度。
4.Up to 5 Gb/s:连接的设备支持 USB 3.1 ( Gen 1 ) 速度。
5.Up to 10 Gb/s:这描述了USB 3.1 ( Gen 2 ) 和 USB 4 连接标准；它们是目前所有Mac上最快的 USB-C 端口。
为获得最佳传输速度，您的USB设备和USB-C电缆还必须支持与端口相同的USB标准。因此，要享受USB 4速度（最高 10GB/s），您的Mac、USB-C设备和USB-C电缆都(all)必须支持USB 4标准。购买USB-C配件和外围设备时请注意这一点。此外，请参阅我们关于 USB 电缆类型的说明(explainer on USB cable types)以了解更多信息。
USB -C(USB-C)集线器（或适配器）也会降低Mac和USB-C设备之间潜在的数据传输速度。确保(Make)适配器或USB集线器支持Mac的USB-C标准。否则，连接的设备将受限于USB适配器的速度。
就上下文而言，如果您将USB 2.0集线器插入Mac，则连接到集线器的设备将被限制为USB 2.0速度。为获得最佳体验，请将设备直接插入Mac或使用兼容的配件。
USB-C：Mac上的 Thunderbolt 3与 Thunderbolt 4(Vs Thunderbolt 4)
MacBook(MacBooks)配备Thunderbolt、Thunderbolt 2、Thunderbolt 3和Thunderbolt 4端口。但是，只有Thunderbolt 3和Thunderbolt 4标准使用 USB-C 接口。它们是向后兼容的高速端口，适用于所有 USB-C 规范/世代。两种标准也具有相同的 40Gbps 最大数据传输速度，但Thunderbolt 4更胜一筹。
Thunderbolt 4具有更好的安全性并改进了对视频数据传输的支持。就上下文而言，Thunderbolt 4 USB-C 连接器可以将视频信号传输到一台 8K 显示器或两台 4K 显示器。另一方面，Thunderbolt 3只能处理一个 4K 显示器。(Thunderbolt 3)目前，只有2020 年推出的采用 M1 的最新 Mac配备(latest M1-powered Macs)Thunderbolt 4或 USB-4 端口。未来的版本也肯定会使用Thunderbolt 4标准。
还没有掌握USB-C和Thunderbolt连接的整个概念吗？或者，您有一些未解决的问题？在下面发表评论，我们会尽力为您提供一些答案。
How to Find the Speed of All USB-C Ports on Your Mac
The USB-C ports on your Mac may all look the same, but thеy’rе sоmetimes built differently. USB-C ports in particular have dіfferent data transfer speeds and power delivеry rates. If your Mac has different USB-C ports, you may find that one рort transfers data (or charges your phone) fаster than otherѕ.
In this guide, we’ll show you how to check the specifications of the USB-C ports and how to identify the fastest USB port on your Mac.
USB-C vs. Thunderbolt USB-C: What’s Different
Apple uses both the regular USB-C and Thunderbolt USB-C ports on MacBooks. As mentioned earlier, these connectivity interfaces can have varying configurations. But because they look the same, it’s often difficult to tell which USB-C port is the regular one and which uses the Thunderbolt standard.
Some laptop manufacturers differentiate these two interfaces by labeling Thunderbolt ports with a “lightning bolt” icon. Regular USB-C ports, on the other hand, usually have the USB label. Although, some manufacturers leave USB-C ports unlabeled too.
Apple doesn’t label the ports on new-generation MacBooks, so it’s almost impossible to tell USB-C ports apart by mere visual examination. In the next section, we’ll show you how to identify your Mac’s USB-C ports and their data transfer speeds.
If you’re new to the whole USB-C vs. Thunderbolt USB-C discussion, or you’d love to learn about their differences, check out this in-depth coverage of the Thunderbolt standard.
What Ports Does Your Mac Have?
When you buy a new Mac, you should see the port configurations on the spec sheet included on the packaging. Some MacBook models also have their screen sizes, year of production, and port configurations suffixed to their product name. So, when you see “MacBook Pro 13-inch (Four Thunderbolt 3 ports, 2020)”, that tells you the type and number of ports on the Mac.
But what if you’ve disposed of your Mac’s packaging? Or, your Mac doesn’t have its port specification in its model name? Apple has a dedicated resource page that can help identify the ports on your Mac. Alternatively, check the online-based user manual or specifications for your MacBook model.
Click the Apple Logo on the menu bar and go to About This Mac > Support and select User Manual or Specifications. That’ll open a new browser window and redirect you to a web page where you can check your Mac’s port configurations.
How to Check USB-C Speed on Mac
macOS has a built-in tool that lets you check the status of your Mac’s hardware, software, and network components.
Follow the steps below to use the macOS System Information tool to check the speed of devices connected to your USB-C ports. This will give you an idea of which port is the fastest on your Mac.
1. Hold the Option key and click the Apple logo on the menu bar.
2. Without releasing the Option key, select System Information.
An alternate way to access the System Information tool is to click the Apple logo, select About This Mac and click System Report in the Overview tab.
3. Expand the Hardware section.
4. Scroll down the left sidebar and click on USB.
In the USB Device Tree section, you’ll find your Mac’s USB-C ports listed according to their versions. You’ll also find detailed information about the USB devices connected to your Mac.
Plug a device into any port and click the device’s name to check the speed that the device or port is capable of. Repeat the steps for other ports to check their speed.
Note: If your device doesn’t appear on the USB Device Tree, close and reopen the System Information window, and check again.
If there’s a Thunderbolt option on the left sidebar, that means some (or all) ports on your Mac support the Thunderbolt standard.
Select Thunderbolt on the left sidebar and check the Speed section for the ports and devices on the list.
USB-C Speeds and Their Meaning
The speed information on the USB Device Tree page tells you the version and specifications of your Mac’s USB-C port. These can help you find the fastest USB-C port on your Mac. Here’s what they mean:
1. Up to 1.5 Mb/sec: A USB-C port or device with this speed indicates a USB 1 connection type.
2. Up to 12 Mb/sec: Ports and devices with USB 1.1 capabilities have this speed.
3. Up to 480 Mb/sec: This tells you that the USB-C device or port is capable of USB 2.0 speeds.
4. Up to 5 Gb/s: The connected device supports USB 3.1 (Gen 1) speeds.
5. Up to 10 Gb/s: This describes the USB 3.1 (Gen 2) and USB 4 connectivity standard; they’re currently the fastest USB-C ports on any Mac.
For optimal transmission speeds, your USB device(s) and USB-C cable must also support the same USB standard as the port. So, to enjoy USB 4 speed (up to 10GB/s), your Mac, the USB-C device, and USB-C cable must all support the USB 4 standard. Take note of this when buying USB-C accessories and peripherals. Also, refer to our explainer on USB cable types to learn more.
A USB-C hub (or adapter) can also slow down the potential data transfer speed between your Mac and USB-C devices. Make sure the adapter or USB hub supports your Mac’s USB-C standard. Otherwise, connected devices will be limited to the speed of the USB adapter.
For context, if you plug a USB 2.0 hub into your Mac, devices connected to the hub will be limited to USB 2.0 speed. For the best experience, plug devices directly into your Mac or use compatible accessories.
USB-C: Thunderbolt 3 Vs Thunderbolt 4 on Mac
MacBooks come with Thunderbolt, Thunderbolt 2, Thunderbolt 3, and Thunderbolt 4 ports. However, only the Thunderbolt 3 and Thunderbolt 4 standard use the USB-C interface. They are backward-compatible high-speed ports that work with all USB-C specifications/generations. Both standards also have the same 40Gbps maximum data transfer speed, but Thunderbolt 4 is superior.
Thunderbolt 4 comes with better security and improved support for video data transfer. For context, a Thunderbolt 4 USB-C connector can transmit video signals to one 8K display or two 4K displays. Thunderbolt 3, on the other hand, can only handle one 4K display. Currently, only the latest M1-powered Macs introduced in 2020 ship with Thunderbolt 4 or USB-4 ports. Future releases will most definitely use the Thunderbolt 4 standard, too.
Still don’t grasp the whole concept of USB-C and Thunderbolt connectivity? Or perhaps, you have some unanswered questions? Leave a comment below and we’ll try to get you some answers.
