I have a 4890 and when the improving time comes I would approximating to be familiar if I be supposed to presently purchase a second 4890 or a 5870. Nope it did not work on Modern Warfare 2, Crysis, or OFDR. Second display presently stayed showing my background at the same time as my primary ran the game. I imagine it presently depends on the game that you utilize. A number of probable presently have support for dual monitors built in such as Supreme Commander as you mentioned. How to fix this issue.