Have looked through FAQ and performed several searches and seem to find this question having been asked. 

1: Do the latest XPS laptops (currently looking at 9520 15" with geforce 3050) have advanced optimus (ie the nvidia GPU outputs directly to the display rather than passthru via the igpu

2: If so, do the external display adapters also have direct connection to the geforce, or will they passthru the igpu?

3: If external display still requires passthru, Has Dell solved the crippling issues with passthru? Despite buying an absolute top of the line 9560 when it came out, gaming performance is unplayable when connected to external display due to the original optimus architecture and poor integration between the igpu and dgpu

Thanks