hi Nic, in the dxdiag the 780m is under the system devices if I remember correctly; I have just installed the latest drivers, 331.93 version, and I will do some tests in the next day, I will let you know what happens... once thing that I noticed with this driver (maybe it's not important), when the installation was complete the brightness was set to the maximum....
never happened with the other driver from nvidia (usually it happens with the microsoft basic driver)... but in the end I was able to adjust it