Hardware–Video

Trying to determine what Omniview device to purchase. One states it handles resolution from 1280 x 1024 at 80Hz and the other 1600 x 1200 at 65Hz. If you run your desktops at lower than 1280 x 1024(as most do) does the Hz have to be set 65 and below for the one model to work? if so would the other one that supports 80Hz supports all Hz up to 80. And is this more exceptable model(the one that supports 80Hz)

Thanks