Uh not to burst the bubble but doesn't eyefinity REQUIRE active dongles? The ones you linked are passive. Or to quote from AMD site:
As an example, using a passive adapter to connect a DVI monitor to a GPU’s DisplayPort connection will essentially cause that DisplayPort output to communicate with the “language” of DVI. As far as the GPU is concerned, it does not have a DisplayPort monitor connected, and therefore cannot leverage the benefits that DisplayPort enables (e.g. AMD Eyefinity technology).