It looks to me that my dual ATI Radeon HD 5870s are compatible with the Acer XB270XU monitor other than needing an odd DVI to Display port cable. Any reasons why this monitor would not work with these cards? I would hate to purchase a monitor and then find out that it would not work. Any help would be much appreciated.
I can't find the monitor you have described. Do you have a link to it please?
Please refer to the HD 5870 specifications here for a list of supported resolutions.