HM903DT/Vision master pro 454

so i got this iiyama vision master pro 454 crt blabla
so this are the stats
1600 x 1200 / 104 Hz
1480 x 1024 / 122 Hz
1280 x 1024 / 122 Hz
1024 x 768 / 162 Hz
800 x 600 / 200 Hz

so what i can get
1600x1200 / 100hz
1280x1024 / 100hz
1152x864 / 140hz
1024/768 / 150hz
800x600 / 170hz

k so now im playing at r_mode 7 120hz
but when i set this monitor to 120hz @1280 the screen goes black and i get some monitor status error
(on 7900gt and 6600silencer)
i pmmed ronner and he says he has 120hz at 1280
so is this a problem more ppl have 2 deal with or is it just me?

or does anyone knows a fix for this? (btw i installed drivers from the iiyama-bg.com website)