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Nvenc

The Nvenc encoder is a hardware encoding chip onboard Nvidia graphics cards. While Nvenc performs slightly worse than X264 at lower bitrate values, it makes up for this by having a near-zero performance impact. This is possible because the encoding chip on the cards is dedicated silicon separate from the rendering cores. It is also for this reason that Nvenc is currently the leader in encoding options for broadcasting, at least until AV1 becomes capable of encoding a live broadcast.