HDMI or DisplayPort: the port does not tell the whole story
Resolution, refresh rate, color, and compression must work across the entire connection. The version printed beside the port is only the beginning.
The complete connectionHow much data the image needsCompression and colorChoosing a cable
Start with the mode you want to use
Before choosing a cable, define the signal: resolution, refresh rate, bits per channel, and whether you need VRR. Then confirm that the graphics card output, monitor input, and cable support it. An adapter or USB-C dock may add another limit.
DisplayPort 2.1 can operate at different UHBR levels. HDMI does not guarantee its version’s maximum on every device either. Check the implemented speed and the manual’s mode table, especially for maximum refresh rate at 10-bit depth or without DSC.
The connection is a chain
Check that specific output's capability: resolution, Hz, color depth, and supported features.
The mode must be supported throughout the chain. Connector appearance or a printed version number does not guarantee a particular speed.
More pixels, more images, more information
What makes the signal larger
Active pixels only · Uncompressed RGB
2560 × 1440 × 144 × 24 bits
This is not a compatibility test. Blanking intervals and link overhead are not included; DSC and subsampling change what is transmitted.
Raw capacity of common links
These are raw speeds, not usable video throughput. A port's version does not guarantee that a device supports its maximum speed.
The example counts only the active image: width × height × images per second × bits per pixel. It helps explain why moving to 4K or raising refresh rate is so demanding, but you should not compare that result directly with a port’s raw Gb/s and assume the connection is valid.
HDMI 2.2 raises the standard’s maximum to 96 Gb/s; that does not automatically make an HDMI input a 96 Gb/s link. HDMI identifies Ultra96 capabilities and allows different implementations. See the official HDMI documentation. For DisplayPort, UHBR20 reaches a raw 80 Gb/s: VESA identifies link levels and their corresponding certifications.
DSC, bit depth, and subsampling are different things
Luminance detail and color detail
Luminance and color detail are preserved at every position. This is the starting point for text and desktop use.
Enlarged samples: Y represents luminance; the lower blocks represent pairs of color components. Chroma subsampling is not reducing bit depth or applying DSC.
DSC: compression for transport
Display Stream Compression reduces link data volume. VESA defines it as visually lossless: it is designed to make compression imperceptible, but that does not mean all data remains identical bit for bit. The devices involved must support it.
I would not reject a monitor simply because it uses DSC. I would check whether its specific combination with your graphics card limits features you need, particular multiple-display configurations, or resolution modes. This is an implementation issue, not an automatic visual penalty.
8 or 10 bits per channel
More bits allow more signal levels per channel. They do not expand panel gamut or make HDR good by themselves. Moving from 8-bit to 10-bit RGB raises bits per pixel from 24 to 30 before compression and link overhead.
4:4:4, 4:2:2, and 4:2:0
Subsampling reduces spatial color information. It can help fit a signal within bandwidth, but desktop use warrants checking fine text and colored edges. For that use, I would seek RGB or 4:4:4 whenever the hardware allows. A signal that “displays an image” does not guarantee it preserves all the information you expected.
How to choose without buying blindly
- Find the exact resolution, Hz, and color-depth combination for each input in the manual.
- Check your GPU, laptop, or console output and VRR compatibility over that specific connection.
- Choose a cable certified for the required capacity. “Gaming,” “8K,” or connector appearance does not replace certification.
- Avoid unnecessary adapters. If using a USB-C dock, check how bandwidth is divided between video and USB data.
- After connecting, check refresh rate, color format, and signal range in the system and monitor.
If you get dropouts or a black screen, first try a direct connection and a known-good cable. Temporarily lower refresh rate or color depth to isolate the issue, but do not treat that adjustment as proof the monitor is faulty.
The original video explanation
Continue checking your setup
The bandwidth calculator helps explore combinations. Before buying, always check the result against the devices’ supported modes. The monitor pages list the recorded connections.