It is listed in the manual posted above too:
Table 20. Video
Feature
Specification
Type
Integrated on system board
Controller:
UMA
Intel HD Graphics 5500
Discrete
Nvidia GeForce 840M Graphics
Data bus
PCI-E Gen2 x4
External display support
•
one HDMI
•
one mDP
NOTE
:
Support one VGA, two DP/DVI ports through
Docking station
Latitude 7450 Owners' Thread
