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There is no reason to use your iGPU for "general purpose" if you have a dedicated GPU.

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Just now, Arkyo0 said:

my laptop can use intel graphics for watching videos while using Radeon for games

That does not give you any performance improvement in games.

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2 minutes ago, Arkyo0 said:

so you cant use iGPU if you connect the port to dGPU?

No.

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23 hours ago, Pip313 said:

Again, there is no reason to want the igpu. The dgpu does everything and more. If you think you will save power, sorry but no. The dgpu still will be on and it doesn’t use much power at all for video playback. 

But how can my laptop uses both GPU?

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