Yea its definitely running fullscreen borderless and not actual fullscreen, if you click on another window on a seperate monitor the focus changes without the primary monitor minimizing the game (which happens when its actually running fullscreen), also if im streaming TV with silverlight it carries on playing, all other fullscreen apps cause silverlight to stop playing soon as the fullscreen kicks in.
Also the performance is not good, averaging 30fps, system specs:
i5 4690k @ 4.5ghz
660ti x2
10Gb memory
vertex4 SSD in sata3
I'm sure if i can get this to run in actual fullscreen mode my performance will increase a lot, its like the sli isnt supported in windowed mode?