Plex Media Server’s hardware acceleration uses Intel Quick Sync Video for decoding and encoding, which is available in all recent Intel Core (i3/i5/i7/i9) processors as well as some other Intel processors (such as some Xeon, Atom, or Celeron models). Hardware-Accelerated Streaming is supported in Plex Media Server on modern Windows, Mac, Linux, and NAS devices. If you’re now interested in hardware-accelerated streaming, you can get started: 1. This is unexpected, and users should report these issues to Plex in our friendly forums.
Some rare video formats may play incorrectly on certain devices. (For instance, output from a “Sandy Bridge” Intel processor typically won’t look as good as from a “Kaby Lake” processor.) 
Earlier generations of hardware typically have lower-quality output than newer generations.(Hardware-accelerated video encoders are faster, but provide lower-quality output than software encoders are capable of.)
This is especially true and more noticeable when streaming at resolutions below 720p or when using lower bit rate source material.
The output quality of video may be lower, appearing slightly more blurry or blocky. There are some drawbacks to Hardware-Accelerated Streaming: By offloading CPU-intensive transcoding tasks to dedicated hardware, video streaming has less of a performance impact on your computer. High-quality videos, especially 4K and HEVC videos, can stream more smoothly. Videos can start streaming faster and buffer less often. More videos can often stream at the same time. Hardware-Accelerated Streaming has a number of advantages: Should I use Hardware-Accelerated Streaming? And if you use the same computer for both work and play, hardware acceleration uses less processing power during video streaming, giving you back the speed you need. When hardware acceleration is turned on, Plex Media Server will use the dedicated video decoder and encoder hardware support in your computer/device to convert videos, letting you stream HD or 4K video more smoothly and stream to more devices at once. To convert videos faster and with less processing power, you can turn on Hardware-Accelerated Streaming in Plex Media Server. Some computers with more powerful processors can even stream multiple videos at once, especially at lower qualities. Using the free, software-based transcoding in Plex Media Server, home computers can seamlessly convert and stream video in real-time to any Plex app. Converting the video (transcoding) happens automatically, in real-time, while you’re playing it. To play your video smoothly and on a huge variety of devices, Plex Media Server often needs to convert the video to a different quality or a compatible format. Tip!: Hardware-accelerated streaming is a premium feature and requires an active Plex Pass subscription.
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