Most Macs are stuck at 4K@60Hz when using standard USB-C to HDMI cables or adapter. The CABLETIME USB-C to HDMI 2.1 cable and adapter with VMM7100 chipset removes this limit and delivers 4K@120Hz on all M1, M2, M3, and M4 Macs — no firmware updates needed.
4K 120Hz Limitations on Macs
Apple’s M-series Macs are powerful enough to drive 4K at high refresh rates. In fact, with the built-in HDMI 2.1 port (on the MacBook Pro 14"/16", Mac mini, and Mac Studio), or through a direct USB-C to DisplayPort or USB-C cable connection, you can easily reach 4K @ 120Hz.
But here’s the problem: when you connect your Mac through a USB-C to HDMI adapter or cable, macOS normally caps the refresh rate at 4K@60Hz. This isn’t because the GPU can’t handle it — it’s a limitation in how macOS negotiates HDMI signals over USB-C.
For Mac users with HDMI 2.1 TVs and monitors, this has been a frustrating barrier. A 60Hz cap means games, videos, and even everyday scrolling feel less smooth than they should.
That’s exactly what the CABLETIME USB-C to HDMI 2.1 cable and is designed to fix.
The Solution 1: CABLETIME USB-C to HDMI 2.1 Cable
Unlike generic USB-C to HDMI cable that get stuck at 4K 60Hz, the CABLETIME cable uses the VMM7100 chipset, which enables full HDMI 2.1 bandwidth over USB-C.
The result is simple: plug in the cable, and your Mac can output 4K@120Hz directly to your HDMI 2.1 display. No firmware flashing. No drivers. No workarounds. Just a smooth, high-refresh experience.
Key Benefits:
- All-in-one design — no need for a separate HDMI cable.
- Works with all M1, M2, M3, and M4 Macs, Supports 4K@120Hz and 8K@60Hz.
- Works with all Window laptop, also supporting 4K@120Hz and 8K@60Hz.
- Premium zinc alloy housing for durability and heat resistance.
- Strong braided jacket for long-term reliability.
- 100% plug-and-play — no firmware updates required.
The Solution 2: CABLETIME USB-C to HDMI 2.1 adapter
If you prefer a more flexible setup, the CABLETIME USB-C to HDMI 2.1 Adapter
is the perfect choice. Pair it with a certified HDMI 2.1 cable, and it delivers the same 4K@ 120Hz performance for Macs — plus support for Windows laptops and other USB-C devices.
Key Benefits:
- Flexible setup — pair with any certified HDMI 2.1 cable.
- Works with all M1, M2, M3, and M4 Macs, supporting 4K@120Hz and 8K@60Hz.
- Compatible with Windows laptops and other USB-C devices.
- Compact and portable — easy to carry with your MacBook.
- Durable zinc alloy housing with excellent heat resistance.
- 100% plug-and-play — no firmware updates required.
How to Set Up 4K 120Hz on Mac
Connect either the CABLETIME cable or adapter + HDMI 2.1 cable to your Mac.
1. Plug the USB-C end into your Mac.
2. Connect the HDMI end to your TV or monitor’s HDMI 2.1 port.
3. In most cases, macOS will automatically switch to 4K@120Hz.
4. If it stays at 60Hz, open System Settings → Displays → Refresh Rate and choose 120Hz manually.
Within seconds, you’ll be running at full speed.
Why 4K 120Hz Matters
Upgrading from 60Hz to 120Hz may not sound huge on paper, but the difference is immediately visible:
- Gaming: Apple Silicon delivers smooth performance in many modern games, and at 120Hz the experience feels fluid and more responsive.
- Creative Work: Video editors and animators benefit from smoother previews, sharper frames, and better motion accuracy.
- Everyday Use: Even simple tasks like scrolling webpages or moving between apps feel easier on the eyes.
- Future-Proofing: With HDMI 2.1 becoming the standard, having 120Hz capability ensures your Mac stays compatible with modern displays.
Once you experience it, it’s hard to go back to 60Hz.
Quick Comparison
| Connection Method | Max Refresh Rate | Limitation |
| Standard USB-C to HDMI | 4K@60Hz | macOS HDMI-over-USB-C limit |
| CABLETIME USB-C to HDMI 2.1 (VMM7100) | 4K@120Hz | Works on all M1, M2, M3, and M4 Macs |
| CABLETIME USB-C to HDMI 2.1 Adapter + HDMI 2.1 cable | 4K@120Hz | HDMI 2.1 cable required |
Does this cable work with Intel Macs?
This cable is designed for Apple Silicon Macs (M1, M2, M3, M4). Intel Macs can use it, but they may not support 4K 120Hz due to hardware limitations.
Which is better — the cable or the adapter?
If you want an all-in-one solution, go with the cable. If you already own a high-quality HDMI 2.1 cable, the adapter gives you more flexibility.
Do I need a special TV or monitor?
Yes. To enjoy 4K 120Hz, your TV or monitor must support HDMI 2.1 with 120Hz refresh rate.
Can this work with Windows laptops?
Yes, both products also support Windows laptops with USB-C DisplayPort Alt Mode, delivering up to 4K@120Hz and 8K@60Hz.
Do I need to install drivers or firmware?
No. The CABLETIME USB-C to HDMI 2.1 cable is fully plug-and-play. macOS will recognize it automatically.
Can this cable support 8K video?
Yes. The cable supports up to 8K@60Hz if your display can handle it.
Questions 7
Conclusion
By default, Macs connected through USB-C to HDMI are limited to 4K@60Hz. With CABLETIME’s USB-C to HDMI 2.1 solutions — the Zinc Alloy Cable or the 8K Adapter paired with an HDMI 2.1 cable — you can finally unlock 4 @120Hz across all M-series Macs.
Smooth gaming, fluid creative work, and a future-proof display connection are now within reach.
Need help setting it up? Contact our support team — we’re happy to assist.
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