For a 15 Mbps upload connection, the safest OBS target for Twitch is 1080p at 60 fps with a 6,000 kbps bitrate, using CBR, keyframe interval 2, and a hardware encoder if your PC supports it well. That setup gives you enough quality for smooth streaming while leaving headroom so your upload does not get overloaded.
Recommended OBS video settings
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Base Canvas Resolution: 1920×1080
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Output (Scaled) Resolution: 1920×1080
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FPS: 60
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Downscale Filter: Lanczos if you need scaling, but keep native 1080p if possible
Recommended stream output settings
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Rate Control: CBR
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Bitrate: 6000 kbps for Twitch
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Keyframe Interval: 2
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Profile: High
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Preset: Quality or Balanced if your system struggles; use the fastest preset that stays stable
Encoder choice
If you have an NVIDIA GPU, use NVENC. If your CPU is strong and you prefer x264, you can use that too, but NVENC is usually the easier choice for 1080p60 streaming because it lowers CPU load. The best preset is the one your system can handle without dropped frames or encoding lag.
Practical advice for 15 Mbps upload
A 15 Mbps line is enough for 1080p60, but you should not push the full connection to the limit. A good rule is to keep your stream bitrate well below total upload capacity so other traffic and network fluctuations do not cause instability. That means 6000 kbps for Twitch is the sweet spot, not the maximum your internet can possibly handle.
If you want maximum stability
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Close downloads, cloud backups, and other streaming devices on the same network.
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Use Ethernet instead of Wi-Fi whenever possible.
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If you get dropped frames, lower bitrate to 5000 kbps or switch to 720p60 until the connection is stable.
