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A Thunderbolt 4 cable is a sound choice for most ultrawide monitors on a Mac, but the cable does not decide the resolution or refresh rate you get. Your Mac model and the monitor’s input set that ceiling. The cable’s job is to carry the video signal that both ends already support. If your Mac and monitor share a video-capable Thunderbolt or USB-C path, a Thunderbolt 4 cable with the right specifications will not be the limiting factor. If either end lacks that path, no cable will fix the problem.
Start with your Mac model
Apple states the rule directly: “The number of displays that you can use at the same time depends on your Mac model and the resolution and refresh rate of each display.” (Apple Support, Connect displays to your Mac.) There is no single maximum that applies to every Mac. Two things follow from that sentence.
- Your exact model matters. Look up the external display specifications for your specific Mac model, not the product line. Note the display count and the resolution and refresh rate listed for each configuration.
- Other displays use the same capacity. If you already run a second or third monitor, the ultrawide competes with those displays for the Mac’s available display capacity.
Confirm the monitor’s input
The cable can only carry a signal the monitor accepts. Open the monitor’s manual or specification sheet and identify which inputs it offers, such as USB-C with video, DisplayPort, or HDMI. Then find the supported resolution and refresh rate for the input you plan to use. Some monitors list different maximum refresh rates for different inputs, so the input you choose can change the result.
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Compare the three connection paths
Most ultrawide setups from a Mac use one of three paths. The table below uses only the values Apple publishes for its cables and adapters. Where Apple’s cited pages do not give a figure, the cell says so.
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- 【Future-proofed Compatibility】The USB 4 cable fully supports the function of Thunderbolt 4. Backward compatible with Thunderbolt 3, USB 3.2 Gen 2, USB 3.2 Gen 2 x 2, USB 2.0. It works seamlessly with all Thunderbolt 4 / 3 / Type-C devices. Compatible with Apple Studio Display, Mac Studio, Mac Mini, MacBook, Surface, iPad Pro, iPhone 17/16, docking station, SSD, power bank, GaN charger, etc. We recommend using cables below 5FT when connecting to the docking for stable performance.
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| Option | Video support | Data and power figures | Best fit |
|---|---|---|---|
| Apple Thunderbolt 4 Pro Cable | DisplayPort HBR3 video output | Up to 40 Gbps Thunderbolt 4, Thunderbolt 3, and USB 4 data; up to 10 Gbps USB 3.2 Gen 2 data; up to 100 W power delivery (Apple, 2024 product specifications) | Mac and monitor both support a Thunderbolt or USB-C video connection; the cable can also charge a laptop |
| Apple USB-C Charge Cable | Does not support video | Up to 480 Mbps USB 2.0 data (Apple, 2024 product specifications) | Charging and basic data only; not suitable for an ultrawide display |
| USB-C to DisplayPort cable or adapter | Carries DisplayPort video; compatibility depends on the Mac, the adapter or cable, and the monitor | Data and power figures not stated in Apple’s adapter guidance | Monitor has a DisplayPort input and the Mac’s port supports the adapter |
The Thunderbolt 4 Pro Cable is one documented example from Apple, not a required brand. Any Thunderbolt cable that meets the same video and data requirements for your setup will work on the same logic. Apple’s cable figures come from its 2024 documentation, so check the current page at About the Apple Thunderbolt Pro Cables before buying.
What the cable’s numbers do and do not tell you
The cable specifications answer one set of questions. They do not answer the question of which resolution and refresh rate your display will run.
The 40 Gbps figure is a shared link rating
The 40 Gbps rating covers the whole link. Data transfer and video share it. A higher rating does not, by itself, raise the refresh rate of a monitor or unlock a mode the Mac or the monitor does not support. The HBR3 video support tells you the cable is built for DisplayPort video output, which is the part that matters for display modes.
Estimating the raw bandwidth of an ultrawide mode
The table below shows simplified arithmetic for uncompressed active pixel data only. These values are not measurements. They exclude blanking intervals and encoding overhead, so the real requirement is higher than shown.
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- Single 8K or Dual 4K Displays: Enjoy ultra-clear visuals whether streaming in 8K or multitasking with dual 4K displays. Note：For dual displays using daisy-chaining, make sure your laptop and display are equipped with a USB-C port supporting DisplayPort alternate mode, or a Thunderbolt port (version 3 or higher).
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| Resolution | Refresh rate | Bit depth | Active pixel data (approximate) |
|---|---|---|---|
| 3440 x 1440 | 144 Hz | 8-bit (24 bits per pixel) | 17.1 Gbps |
| 3440 x 1440 | 144 Hz | 10-bit (30 bits per pixel) | 21.4 Gbps |
| 5120 x 1440 | 120 Hz | 8-bit (24 bits per pixel) | 21.2 Gbps |
| 5120 x 1440 | 120 Hz | 10-bit (30 bits per pixel) | 26.5 Gbps |
On paper, these figures sit inside a 40 Gbps rating. The practical ceiling still comes from the display standard, the Mac’s display limits, and the monitor’s input. That is why you verify the mode on the screen rather than assuming it from the cable label.
Power delivery if you charge a laptop
If the same cable will also charge a laptop, the 100 W power delivery figure for the Thunderbolt 4 Pro Cable matters. Confirm that your charger and laptop accept that level of power. The charge-only USB-C cable’s 480 Mbps data limit and lack of video support make it a poor choice for this use.
Rank #4
![Cable Matters [Intel Certified] 40Gbps Thunderbolt 4 Cable, 3.3ft / 1m](https://m.media-amazon.com/images/I/41lpiJCsNCL._SL160_.jpg)
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- Certified Thunderbolt 4 Cable with 240W PD: This certified Thunderbolt 4 cable supports the latest Thunderbolt 4 features, delivering reliable 40Gbps data transfer across all Thunderbolt 4 devices. Power and charge devices efficiently with USB Power Delivery (PD) 3.1 support up to 240W charging.
- 8K Video and High Bandwidth Support: The USB C Thunderbolt cable 4 delivers enough bandwidth to drive one 8K display or two 4K displays. Connect high-definition monitors and TVs for vibrant 8K video and rich, high-quality audio. Compatible with Thunderbolt 4 monitors including Dell UltraSharp U3224KB, Dell UltraSharp U4025QW, and BenQ PD3225U, making it ideal for creators, professionals, and gamers.
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- USB4 Compatibility with Full Feature Support: This Thunderbolt 4 cable also functions as a USB 4 cable, supporting 40Gbps data transfer, DisplayPort Alt Mode (DP Alt Mode), and USB-C Power Delivery. Fully compatible with USB4, USB-C 3.2, 3.1, and 2.0 devices. This USB-C cable works flawlessly with Thunderbolt 4 computers including MacBook Pro M4, Mac Mini M4, Dell XPS 13 Plus (9320), XPS 17 (9730), and HP Spectre x360 14, ensuring high-speed performance across platforms.
Set and check the mode in macOS
Once the monitor is connected, use these steps to confirm which resolution and refresh rate your Mac is using.
- Connect the cable or adapter to the Mac and to the monitor, then power on the monitor.
- On the monitor, select the input that matches the cable you are using.
- On the Mac, choose Apple menu > System Settings, then click Displays.
- Select the ultrawide monitor from the list of displays.
- Set Resolution and Refresh rate to the combination you want. Apple describes configuring these settings in System Settings > Displays.
- Check the monitor’s own on-screen menu as well. Some display settings, including certain refresh-rate or input options, may be available only through the monitor’s controls rather than macOS.
If the mode you expect is missing
Work through these checks in order. Each one rules out a different cause.
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- All-in-One Solution: A single USB C to C cable handles 240W charging, 80Gbps data syncing, and 16K max video output. Seamlessly connect USB C laptops, such as MacBook Pro Air, Dell XPS, phones,such as iPhone 16, Galaxy S24, tablets like iPad Pro, monitors, and accessories. Supports Thunderbolt 4 3, USB4, USB 3.2 3.1 3.0, and more
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- Mac limit: Confirm your exact model’s display count and the resolution and refresh rate listed for it. Disconnect other displays temporarily to see whether capacity is the issue.
- Port type: Confirm that the Mac end of the cable uses a Thunderbolt or USB-C port that supports video. A port with a USB-C shape does not establish video capability. Apple’s guidance on Adapters for the Thunderbolt or USB-C port on your Mac explains how to identify the port and choose a compliant adapter.
- Monitor input: Confirm the monitor supports the mode on the input you are using. If it has a second input, such as DisplayPort or HDMI, test that input with a compliant cable or adapter.
- Cable type: A charge-only USB-C cable cannot carry video. Replace it with a video-capable Thunderbolt cable or a compliant USB-C to DisplayPort cable or adapter.
- Settings: After each change, return to System Settings > Displays and check the resolution and refresh rate again.
If the mode still does not appear after these checks, the limit is most likely the Mac model or the monitor itself. Compare your exact model and monitor against their published specifications before buying a replacement cable.
Quick Recap
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