OK, I'm confused.
When I clik the thread, I get something about Oly Audio stuff, but now below my reply window is something about the Radeon...
Refresh rates are more dependant on the monitor than the card these days.
There are usually two tables, suggested and all possible. 75Hz is probably "suggested". Both my Radeon and Orion will do 1024 at 85 and 1280 at 75 on the ancient monitors I have, although 1024@75 is "suggested".
Zack