Hi! I have too identical laptops, both XPS 9550 with 960M on them. On my old 9550 i got all the option in photoshop with Use graphic processor to accelerate computation shown in the phothops and its missing in new the other laptop. I use same graphic drivers and I choose to use Nvidia 960M graphic card for Photoshop and Sniffer. Please let me know how to enable this option as I run out of ideas and photoshop is a bit laggy without it.
The latest Photoshop build has issues with recognizing and using mid-range graphic cards. This would cause this issue. Revert back to a previous build of Photoshop for now until a resolution is posted in an update.
Adobe Community Professional/Adobe Certified Instructor