Easy way to tell on all present TN panels:
Tilt the display back & watch how dark & distorted the picture becomes.
Typical of 6-bit TN panels.
While not an entirely scientific method, it works well.
Edit: It appears to be S-PVA according to all the links i could find; even Samsung's site describes it as a PVA panel.
So it is actually likely an 8-bit panel.
I imagine one of the LCD gurus here can confirm that.