Agreed. Viewing angles of 170/160 mean it's a TN panel. To see the difference for yourself, tilt the monitors back temporarily so you can view them from below. A TN panel will darken or even invert colors, whereas an IPS panel will have no color shift. Alternatively you can look at http://www.lagom.nl/lcd-test/viewing_angle.php
across both monitors.
I would advise against using Eyefinity with only two monitors - that will mean the center of the viewing area in games is right in the middle of the bezels.