Dock, hub or adapter for your MacBook: HDMI, USB-A, charging

Modern MacBooks have few ports, so sooner or later you need an adapter, hub or docking station: for a monitor over HDMI, an ordinary USB stick, a network cable or a memory card. But what is the difference, and what suits your MacBook? This article explains how to choose the right one and how to avoid charging problems and flaky monitors.

Blue Apple repairs MacBooks in Amsterdam. We regularly see MacBooks with a damaged USB-C port because a heavy hub hung from it. More about that below too.

Adapter, hub or dock: what is the difference?

• Adapter: one connection to one other, for example USB-C to HDMI or USB-C to USB-A. Small and cheap.
• Hub: a small block with several connections, often HDMI, a few USB-A ports, a card reader and a USB-C port for pass-through charging. Handy to carry.
• Dock (docking station): a larger device with its own power supply that sits on your desk. One cable to your MacBook, and everything (monitors, keyboard, network, charging) is connected to it.

USB-C or Thunderbolt?

Your MacBook's ports are USB-C and usually also Thunderbolt. An ordinary USB-C hub works on any MacBook. A Thunderbolt dock is faster and can handle more monitors and fast drives at once, but costs more. For a monitor, a mouse and a USB stick a good USB-C hub is enough. If you work with fast external drives or several large screens, look at Thunderbolt.

How many monitors can your MacBook handle?

That depends on the chip. A MacBook Air with the base chip long supported only one external monitor; from the M3 the Air can drive two external screens with the lid closed, and from the M4 also with the screen open. The MacBook Pro with a Pro or Max chip can do more. On a MacBook that supports only one external screen, a hub with two HDMI ports shows the same picture on both, or only one. So first check what your model can do, in the specifications on Apple's site.

What to look for when choosing

1. HDMI version. For a 4K monitor at 60 Hz you need HDMI 2.0 or higher. A cheap hub often only manages 30 Hz, and then the pointer feels sluggish.
2. Pass-through charging (Power Delivery). Choose a hub with a USB-C charging port that passes on at least your charger's power. A hub keeps part of the power for itself.
3. Heat. Hubs get warm. A hub that gets hot can falter or drop the connection.
4. Weight and cable. A heavy hub hanging directly in the port pulls on the port. Rather choose a hub with a short cable, especially if your MacBook sits on your lap.

Problems with a hub or dock

• Monitor shows no picture: try another cable, another port on the MacBook and possibly connect the monitor directly. If it works directly, the hub is to blame.
• MacBook does not charge through the hub: connect the charger directly. If it charges then, the hub delivers too little. Also read which charger fits your MacBook.
• Devices keep dropping out: often a hub that is too weak, or a port making poor contact.

If a port does not work properly even without a hub, or the plug has to sit at a certain angle to charge, the port itself is damaged. We often see that after a hub or cable hung in it at an angle for a long time.

What we do at Blue Apple in Amsterdam

We measure whether a USB-C port still makes good contact and passes enough power, and replace the port if needed. You hear beforehand what needs doing and what it costs. More on our page about MacBook charging port repair.

Frequently asked questions

Does a USB-C hub for Windows laptops work on a MacBook?

Usually yes, as long as it is an ordinary USB-C hub. Docks with special drivers do not always work on a Mac.

Can I connect two monitors to a MacBook Air?

That depends on the chip. Check the specifications of your model for how many external screens it supports.

My hub gets hot. Is that bad?

Warm is normal. Hot, with flaky connections, is a sign the hub is overloaded or of mediocre quality.