intel intergrated graphics card and external graphics card work together?

[Reyoch Ch]

I have i5 3450 hd 2500 internal gpu and msi r9 270x will it work together and increase performance..??

 

[uthvag]

no the integrated gpu will turn off as soon as it detects your 270x which s powerful

So no increase in performance(mobo are not designed on that way)