@Grazie OK, I just did the same, the PressReleaseProject as Magix AVC NVENC render = 00:17 and as Magix AVC QVC = 00:15. Strange that's a huge difference between mine QSV render and yours (No typing error of you?)
Also whatever I do, a QSV render is always quicker than a NVENC render.
Do you have Voukoder installed? The same render with Voukoder = 0:24 results in a 3 time smaller file than with Magix AVC, Voukoder when I visually compare, has also a little better quality.
What drivers do you have installed for IGPU? Have found the driver supplied with MB much better than latest as found by VP. If you make changes note driver number currently installed. With the right driver I to find QSV faster AVC NVENC. In many cases drivers found via VP>Help>Driver updates resulted in Preferences>Video>GPU Accl showing Intel driver unsupported. NVENC 36s QSV 33s. With unsupported driver QSV runs out to around 60s.
Perform a render that should invoke the GPU. Open up TaskManager > performance as per JV above. Look for GPU at bottom of list. It looks as though the render options may not be telling the full story. Wishful thinking springs to mind on VP's part by way of true render options.