I have tested the HD 4400 on my Dell Latitude 3540 with Star Trek Online, Mass Effect 3, and a little bit of Skyrim. The laptop has a Core i5-4200u and a Radeon HD 8850m, but I disabled the Radeon and I also disabled speedstep so that the CPU only maxes out at 1.6GHz instead of 2.6GHz.
Playing those games at 1920x1080 was not really very good. However, Star Trek Online plays fine at 1600x900 resolution with a mix of low and medium graphic settings (mostly low though). I had no problems with Mass Effect 3 at 1600x900 resolution except for a bit of mouse lag with a wireless mouse. I forgot how to fix that issue off the top of my head since I got that before on a different laptop so I just plugged wired mouse. Skyrim plays best at...