Generally, a dedicated graphics card is recommended (but not required):
http://www.graphisoft.com/support/system_requirements/AC19/
Intel's onboard video gets more powerful every year, so I can't say if it will be adequate for your needs when displaying the 3D OpenGL window - someone with the model might chime in, or if you have a standard return policy, you can try it and return your order if it isn't satisfactory?
Neither ArchiCAD nor CineRender use OpenCL ("C" not "G") which allows computations to be performed on the graphics component. So, the much higher OpenCL performance of the dedicated card doesn't buy you anything.
Do note that AC 17 is not listed as compatible with El Capitan, which you will receive with a new Mac.
One of the forum moderators
AC 27 USA and earlier • macOS Ventura 13.6.9, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB