any ideas on dell m4800+geforce 860?

hello!
making some research.
any one tryed to swap gpus in dell m4x00 series?
i know cards must be mxm type A.
but any real experience?

 

QHD workstation with 860m , 960m

There is story people upgrade m4700 with k2100M. Haven't read any people had put 8xx in any precision though.

Edit: just remember the mxm 860m isnt maxwell though, so no much point imo. Eh not sure about the 3.0A

 

hehe=) you read from my mind=))
4k+960m or
aorus x3 plus updated. but abit afraid of bad colling=/