For a standard SDR 4K 60fps gaming stream, start with OBS Hardware (NVENC, AV1) at P6: Slower (Better Quality). Set rate control to CBR, bitrate to 35 Mbps, and keyframe interval to 2 seconds. This is a practical starting configuration supported by OBS’s NVENC guidance and YouTube’s current recommendations—not a universal RTX 4070 benchmark winner. Test it with your actual game and watch YouTube’s stream health before relying on it for a live event.
Recommended OBS settings for SDR 4K60
In OBS, open Settings > Output, set Output Mode to Advanced, then open the Streaming tab. Select the following as your starting point:
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| Setting | Starting value | Notes |
|---|---|---|
| Encoder | Hardware (NVENC, AV1) | OBS’s NVIDIA guide recommends NVENC AV1 for YouTube with RTX 40-series GPUs. |
| Rate Control | CBR | YouTube recommends constant bitrate for live ingest. |
| Bitrate | 35 Mbps | YouTube’s current recommended AV1/HEVC bitrate for 4K/2160p at 60fps. Your upload connection must sustain it. |
| Keyframe Interval | 2 seconds | YouTube recommends 2 seconds and says not to exceed 4 seconds. |
| Preset | P6: Slower (Better Quality) | A quality-oriented OBS guide starting point; it is not a controlled RTX 4070 benchmark result. |
| Tuning | High Quality | Use the High Quality tuning option in the OBS NVENC guide. |
| Multipass Mode | Two Passes (Quarter Resolution) | Guide starting point. |
| Look-ahead | On | Turn it off if GPU utilization is high or the stream becomes unstable. |
| Psycho Visual Tuning | On | Guide starting point. |
| Max B-frames | 4 with Look-ahead on | The guide suggests 2 if Look-ahead is off. |
OBS labels can vary by release. If a setting is not shown in your version, do not substitute a guessed value; use the closest available option and verify the resulting stream in a test.
Choose the codec for SDR or HDR
SDR: start with AV1
For SDR, AV1 is the strongest starting choice supported by OBS’s RTX 40-series guidance and YouTube’s bitrate guidance. YouTube recommends 35 Mbps for AV1 or HEVC at 4K60, compared with 50 Mbps for H.264. Those recommendations do not establish a specific visual-quality improvement on every stream or a measured head-to-head result on an RTX 4070.
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HDR: use HEVC/H.265
For YouTube HDR, choose HEVC/H.265 rather than AV1: YouTube says AV1 is not supported for HDR and recommends H.265 over RTMP(S). YouTube lists 10-bit for HDR, and OBS’s guide calls for HEVC with the Main10 profile. Confirm the rest of your HDR workflow—including game output and OBS color settings—matches your intended HDR signal; the SDR settings above should not be treated as a complete HDR configuration.
When H.264 is the practical choice
If you need H.264, use YouTube’s recommended 50 Mbps for 4K60, provided your upload can sustain it. The available guidance does not establish that H.264 at that bitrate will look better or worse than AV1 in your specific game and setup.
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Check the YouTube and connection requirements
YouTube’s live encoder guidance lists RTMP/RTMPS ingest, H.264, HEVC and AV1, and frame rates up to 60fps. It recommends RTMPS, CBR, and a 2-second keyframe interval (no more than 4 seconds). These are platform recommendations, not guarantees of image quality or connection stability. Leave headroom beyond the video bitrate for audio and normal upload variation; a line that only intermittently reaches the target is not a dependable 4K60 uplink.
YouTube says 4K live streams are optimized for quality at normal latency. Its low-latency option is unavailable at 4K: “For 4K / 2160, the option to improve for low latency is not available.” Plan for that trade-off if rapid chat interaction matters.
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Test without overloading the RTX 4070
- Set the OBS values above and connect OBS to the intended YouTube live stream using the stream key for that broadcast. Treat the key as a secret; anyone with access to it may be able to send video to your stream.
- Run a private or unlisted test, if appropriate for your channel, using representative gameplay, scene transitions, overlays, capture sources and audio. YouTube’s guidance is direct: “Make sure to test before you start your live stream.”
- Check OBS for rendering or encoding lag and YouTube’s stream health for ingest problems. A preset cannot compensate for an upload connection that does not sustain the chosen bitrate.
- If rendering or encoding becomes uneven, reduce GPU demand first: cap the game’s frame rate or lower graphics settings. If GPU utilization remains high, disable Look-ahead and try the guide’s two B-frames setting. Retest rather than changing several settings at once.
- If the test remains unstable, lower the bitrate to a rate your upload can hold or step down resolution or frame rate. The result may no longer meet YouTube’s recommended 4K60 bitrate, but stable delivery is more useful than a nominal setting the connection cannot maintain.
The encoder and game share GPU resources. OBS’s NVENC guide warns that high GPU utilization can cause stream lag; outcomes vary with the game, driver, OBS release, scene complexity, capture setup and upload stability. P6 is a reasoned starting point, not proof that every RTX 4070 system can render and encode every game smoothly at 4K60.
Common problems and what to change
- YouTube reports poor or unstable stream health: Check that the upload can sustain the configured bitrate, confirm CBR and a 2-second keyframe interval, and test again. Reduce bitrate or output demands if the connection remains unstable.
- OBS reports rendering lag while gaming: The game may be consuming too much GPU capacity. Cap its frame rate or lower graphics settings, then retest.
- OBS reports encoding lag or the stream stutters under load: Reduce GPU workload and disable Look-ahead if utilization is high. If Look-ahead is off, use 2 B-frames as the OBS guide suggests.
- HDR is unavailable or the picture is not HDR: AV1 is not YouTube’s HDR path. Use HEVC/H.265 with Main10 and check the complete HDR signal chain rather than applying the SDR AV1 recommendation.
- The stream uses the wrong YouTube broadcast: Check that OBS is using the stream key associated with the intended event. Replace a key if it may have been exposed.
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For prerecorded streams, confirm you have the rights to the video, music and other material you upload, and review YouTube’s live-stream and monetization policies. A stream being technically stable does not establish that its content is authorized or eligible for monetization. Use the copyright safety checklist before scheduling a loop. For planning large uploads, StreamNeo also provides an upload-time calculator and a cloud vs PC cost calculator.
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