Well it depends on the application.
If for example in GPU intensive applications - like higher end games, then your GPU works hard whilst your CPU takes it easy.
But then equally in CPU intensive applications, like editing, your CPU will work really well.
So basically, when you need more graphics, your CPU is more than enough, but your GPU is put under higher loads.
Nothing harmful comes from it, just means you can't play at top settings until you upgrade your GPU.
Or you can continue being very effective with CPU intensive applications.
That's just a general summary though.
Is there anything in particular you're worried about?