HDMI Alt Mode supports HDMI 1.4b which does support 4K video, but only up to 30 frames per second (it does not support HDMI 2.0). While this may be adequate for office PC applications, casual web browsing, and photo editing, 30 frames per second is not adequate for gaming and high quality video playback. How to check if my windows laptop supports 4K resolution (even though its display does not support)?1. Go to Device Manager2. Find the display adapter type3. Recommendations Does My Monitor Have 4k? You may have seen the term 4K used in the description of some of the latest televisions, monitors, and even some mobile phones. But what does it mean? 4K refers to the screen resolution, which is the number of pixels that are displayed on the screen. To play streaming high dynamic range (HDR) video in Windows 10, your external display and Windows 10 PC need to support HDR. To find the specifications for a specific PC or external display, visit the device manufacturer's website. Here are the requirements: The HDR display or TV must support HDR10, and DisplayPort 1.4 or HDMI 2.0 or higher. Cable Doesn't Support 4K Yet Are You Actually Streaming in 4K? Are You Watching DVDs or Blu-Ray Discs? Not All Video Games Are 4K Some TV Apps Might Tell You When You're Watching 4K A common complaint about 4K TVs is that they don't look any better than HD TVs. But the problem is rarely the TV's fault. wb3RTjr.