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if I use the mobo ports to plug in my monitor, will it make my GPU useless and ONLY use the iGPU?

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Yes, most of the time they won't even work.

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Yes!

It'll make your GPU useless.

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depends. AMD cards will give the iGPU a piggyback ride - so to speak - if you enable iGPU multi-monitor in bios and plug a monitor into motherboard.

 

I believe with Nvidia this is not the case.

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