There are two models - I got the one with integrated HDTV which isn't 120Hz. They must have confused it with the S model which is 120Hz and has no HDTV built in.
"But it isn’t all about the looks. The monitors offer an integrated 3D solution driven by a pair of Samsung stereoscopic 3D glasses and the included TriDef PC software. The ‘SA’ series monitors also have another trick up their sleeve in the form of true 120Hz output. The ‘TA’ series hybrid monitors, on the other hand, forgo this capability and instead offer integrated digital TV and a host of other related features."
Source: http://www.pcmonitors.org/monitor-reviews/samsung-t27a950