Even if you already have the right connections on your computer hardware, you'll likely need to buy new displays to get DisplayPort multistreaming, and such displays don't come cheap. The high-performance Dell U2413, for instance, costs about $600. If I could afford it, I'd happily invest in three daisy-chainable displays that possess the same dimensions and resolution--but doing so would require more coin than I'm prepared to part with right now. Let's hope the display industry embraces multistreaming DisplayPort in a bigger way and introduces more consumer-oriented models soon. As I said earlier, DisplayPort rocks.
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