jaymonkey
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I think in this post you were asking about my post? If it was, Vega is faster than iGPU, however, I still would like a complete system where iGPU is used for some tasks. However, enabling iGPU breaks DRM compatibility.
@Tom012, @mafx3,
MacOS will always favour IQS (Intel Quick Sync) for some tasks even if you have two Vegas installed, also there are some features that will only work on the IGPU such as AirPlay Mirror, this allows MacOS to use the IGPU for video encode/decode even if the dGPU is being heavily utilised EG: FCPX running in Background exporting a large video file.
MacOS basically load balances GPU tasks between the IGPU & dGPU, light tasks will be sent to the IGPU, heavy tasks sent to the dGPU or both, this is why it's important to enable the IGPU and configure it as headless as this is how most iMacs are configured in real life, it's a clever and efficient use of system resources.
Cheers
Jay
Update: I added a new section to the end of the WhatEverGreen Chapter detailing DRM playback issues.
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