Does their website list all cards that are compatible, and you can't find the 5970 on that list?
Or, does their website list all cards that are incompatible, and your 5970 is on that list?
Why is there a compatible problem with Shimia 2560x1440.
After checking out many reports and ordering one myself tonight, I believe that they mean you will not see your bios screen with the 5970. Windows will show OK. Once you have a dual link DVI port, everything should be good except for the mentioned limit.