Dedicated GPU + CPU vs dedicated GPU + APU

[Tomcat76]

For my current project, I'm assembling a slightly older-gen PC (era Z270/X299), though I guess this question applies to systems of any era.  I will be using a dedicated graphics card regardless of whether the CPU has built-in graphics, but does it make a difference in terms of stability whether I use it in combination with a CPU with graphics built-in or one without graphics?  I'm sure that an i7-9800X or i9-9900X (Skylake-X Refresh) would give me better cpu performance over an i7-6700K (Skylake) or even an i7-7700K (Kaby Lake), but I'm only wondering about stability.

[HarryTri]

A lot of computers (including my laptop) have a CPU with built-in graphics and a separate GPU without any problems. You just can't use both of them together (you must choose which one you want to use and switch to the other if you want).

[Tomcat76]

OK.  Thanks.