When using a simulcast provider, your broadcast is only transmitted once from your machine, and then duplicated from your chosen service. This reduces common problems such as buffering, frame drops and high resource usage on your streaming PC. Bandwidth required for 1080p HD streaming Upload speed: 4,256 KBPS Video: 4,000 KBPS Audio: 256 KBPS Bandwidth required for 4K UHD streaming Upload speed: 8,320 KBPS Video: 8,000 KBPS Audio: 320 KBPS Multiple streams with OBS would not be recommended with the above bandwidth unless using a simulcast service.