Hi everyone. I am having issues with my Dell 3008wfp 30" display on my Mac Pro 2008. I am using a PC card: HD7950, Dual-link DVI cable. Any resolution other than 1920x1200 has artifacting and I really would like it to run at the proper 2560x1600 resolution. Is it a problem with my GPU or is it that I should use a different cable?