Monitor Stuck at 60Hz in Windows 10 or 11? Check Your HDMI Cable and Display Settings

What happened​

Rozario runs an RTX 4090 with two Alienware OLED monitors. The newer AW2725DF is his main display, and the older AW3423DW ultrawide became the secondary. He reused a spare DisplayPort cable for the new monitor. For the ultrawide he grabbed an old HDMI cable from a drawer.

He knew HDMI would cap the ultrawide below its 175Hz DisplayPort maximum, and he expected 100Hz. The cursor felt sluggish, though. Windows Display Settings showed 60Hz, with no 100Hz option to select.

The fix was to use the HDMI cable that shipped in the AW3423DW's box. After that, 100Hz appeared in Windows with no other changes.

This is one writer's account of his own setup. It isn't a controlled test. It is plausible and matches how HDMI cable categories work, but I found no independent confirmation of his specific cable.

Why a cable can cap your refresh rate​

Resolution, refresh rate, bit depth and color format together set how much data the GPU sends each second. A cable has to carry that data cleanly. The key point is that a marginal cable usually doesn't fail outright. You still get a picture, but the higher modes may simply not be offered.

HDMI cables are sold by category rather than by version number. Retail guides in the search results agree on the main tiers:

• High Speed HDMI is listed at 10.2Gbps, Premium High Speed at 18Gbps, and Ultra High Speed at 48Gbps.
• One cable retailer's guide notes that cables don't have version numbers. The "HDMI 1.4" or "HDMI 2.1" labels are loose shorthand for how the categories pair with devices.
• The same guide says Ultra High Speed certification only launched in 2020. A cable older than that can't be an Ultra High Speed cable.

The HDMI Licensing Administrator, the body that runs the certification programs, backs up the two upper tiers. Its Premium High Speed program says cables are tested to support the full 18Gbps bandwidth. It also describes the Ultra High Speed cable as applicable to system configurations supporting up to 48Gbps. These are cable-category ratings. They don't promise that a given monitor port will offer a given resolution and refresh rate.

Rozario's old cable was marked only "High Speed", which sits in the 10.2Gbps tier. He argues that tier can't carry 3440×1440 at 100Hz. I'd treat that as a reasonable reading rather than a measured result. The evidence we have for it is the before-and-after swap.

The monitor's port sets its own ceiling​

A good cable doesn't override what the port can do. Dell's published specifications for the AW3423DW list 3440×1440 at up to 100Hz over HDMI and up to 175Hz over DisplayPort. So 100Hz was the right HDMI target here.

The AW2725DF is a sharper example. Dell lists it at up to 360Hz over DisplayPort but only up to 144Hz over HDMI, and it describes the HDMI mode as TMDS. In practice, a 48Gbps Ultra High Speed cable won't unlock 360Hz on that HDMI input. The port stops at 144Hz regardless of cable.

Rozario's newer AW3425DW comparison also checks out against Dell's listing. It is specified at 3440×1440 and up to 240Hz over HDMI, with FRL signaling. So a monitor's "HDMI 2.1" label doesn't tell you its HDMI maximum. Read the per-input spec table instead. I'd also avoid his broader claim that "most OLED monitors" ship with a particular HDMI implementation. The evidence covers these specific Dell models.

Troubleshooting order for a stuck refresh rate​

Work through these in order, cheapest check first.

1. Check Windows settings. Open Start > Settings > System > Display > Advanced display. If you have several monitors, pick the right one from the display selector. Then open the Choose a refresh rate list. Microsoft notes that the available rates depend on the display and what it supports. Rozario adds that Windows often defaults to 60Hz, and he has had to switch manually on every monitor.
2. Mind the asterisks. Microsoft says an asterisk next to a rate means it doesn't support your current resolution. Picking it will change your resolution to reach that rate.
3. Check the monitor's spec for the input you're using. Look up the maximum refresh rate for HDMI and for DisplayPort separately. They are often different.
4. Read the cable. Look at the printing on the sleeve and any packaging. A cable with no category printed on it should be treated as the older, lower-bandwidth end of the range. For HDMI modes beyond 4K at 60Hz, aim for a certified Ultra High Speed cable.
5. Try a known-good cable. Use the one that came with the monitor if you still have it. Rozario's fix was exactly that.
6. Verify the GPU output and mode. If the rate is still capped, check that your GPU output and chosen resolution match what the display supports. Also consider DisplayPort if the monitor offers a higher ceiling there.
7. Recheck the refresh rate list after every change.

Buying a replacement​

If you do need a new HDMI cable, certification matters. The HDMI Licensing Administrator says resellers may not use the official HDMI Cable name designations, and that some cables are counterfeit. Its certification labels carry a QR code for verification. Retail guidance in the search results says phrases like "8K ready" or "HDMI 2.1 compatible" are not the same as official Ultra High Speed HDMI certification.

Be careful with the claim that 4K/144Hz needs an Ultra High Speed cable. It is a sensible default. The actual bandwidth need depends on color format, compression and what the monitor and GPU implement. A cable's rating is a floor, not a guarantee of a particular mode.

Takeaways​

• A cable that carries a picture can still be too slow for your monitor's higher modes. That makes the fault easy to miss.
• Check Windows' Advanced display list first, then the monitor's per-input spec, and only then suspect the cable.
• The HDMI port's ceiling can be lower than the cable's. Dell's AW2725DF tops out at 144Hz over HDMI, however good the cable.
• The cable in the monitor's box is often the quickest known-good test. Keep it.
• When buying, look for the official certification label rather than marketing terms.