Help! Are the Ryzen APUs good on AutoCAD?

[PlzDuntCensorME]

I'm debating on getting a Ryzen 2400G but I'm not technical so I cant really understand articles or reviews on the Ryzen APUs. I do have 3 questions about the Ryzen APUs and I'm wondering if you can answer them, it's fine if you can't answer all of them.
1) Does the Ryzen 2400G integrated graphics disable with a GPU installed?
2) Is the Ryzen 2400G good on AutoCAD or similar programs as a standalone?
3) Would a Ryzen 1600+GTX 970 do better in AutoCAD compared to the Ryzen 2400G+integrated graphics?

The PC will mainly be rendering on AutoCAD.

 

[CountMike]

1. Unknown yet.
2.As good as any Ryzen with 4 cores, 8 threads and graphic is supposed to be on a level of RX 550 standalone card.
3. 1600 has 6 cores and 12 threads so yes, would be better than 2400g, GTX 970 should also be better than IGPU in 2400g.