Integrated CPU with added Discrete GPU

[TexasIndian]

Waaaay confused.    After learning differences between desktops with Integrated  cpu's versus 

those with only Discrete gpu's; I now realize Discrete gpu is the path for me.  Now I discover the

4 desktops on my comparo shopping list, two are actually Integrated  (12700 & 5700G) with an

ADDED Discrete gpu??  HUH??? 

1.  How does this 'dual-gpu' system work?  ...function??  ...share???

2.  How successful?  Rather is sole Discrete gpu better/smoother/etc. than mixing both?

[banhien]

@TexasIndian 

Normally when adding a Discrete GPU to desktop system would automatically disable the iGPU

Regards.

[TexasIndian]

Sounds like you're saying: having an IGPU is useless if have GPU installed too...correct?

If so, then what is the purpose of a pre-built desktop with BOTH?  Why not only a GPU?

[banhien]

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@TexasIndian wrote:

.... Sounds like you're saying: having an IGPU is useless if have GPU installed too...correct?

If so, then what is the purpose of a pre-built desktop with BOTH?  Why not only a GPU?

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@TexasIndian 

Yes, No choice iGPU will automatically come with CPU/Processor therefore we HAVE to have both on machines. On many notebooks, we can use BOTH.

Regards.