Any idea what is wrong with my nvidia surround setup?

[oEYSo]

Hello guys! I got myself into this stuff recently, I have all monitors with dual-link dvi cable, all are the same displays (acers 120hz) I'm running standard resolution (5760x1080p) any idea why I cant run my setup @ 120hz :/? i'm getting frustrated because I can't figure out what is wrong...any help is appreciated !!