How many non-DisplayPort monitors can I use with an ATI Eyefinity technology-enabled graphics card?
You can connect up to two non-DisplayPort monitors at one time to an ATI Eyefinity technology-enabled graphics card using non-DisplayPort connections or passive DisplayPort dongles. To enable and drive 3 or more non-DisplayPort monitors at one time, the additional non-DisplayPort monitors must be connected with an active DisplayPort dongle.