Edit: there may be something that doesn't add up here. I can do an expanded display (2 monitors) with the DisplayPort connection (using the DVI adaptor). That shouldn't have worked at all, isn't it?
Nope. That works. The card has two of these hardware timers, and will allocate them to the first two monitors that are connected, basically. The problems don't start until you connect three monitors.
The bitstreaming software support isn't quite there yet, but it is coming. It is fully enabled in the drivers, but there are currently no decoders available that fully support it. The Doom9 people are trying to hobble it together. Cyberlink and TheaterTek are both working on official support for it in their next versions of their players/decoders, but they aren't released yet. As of right this very second, it is very difficult to use the bitstreaming support on the 5x00 series cards, but that won't last long (word is that the Cyberlink software supporting it should be out by the end of the year).
So, pretty much this is where my dream of having a cheap card driving 3 (or more) monitors stops. Back to the 2 cards setup.
I was suspecting that a $5.22 DisplayPort to DVI adapter (cue for laughs) is not gonna cut it, but then I'm not sure how this is going to work at any rate. The prices for any DisplayPort LCDs - all what, 4 of them? - are $150-200 higher than a normal LCD of the same size. Expensive adapters are out of the question, it's either freaking working as it should or not at all. So I guess it's not at all.
That's really too bad that you didn't know this ahead of time... I'm sorry.
In reality, it is hard to blame AMD for this. Those Passive DVI<>DisplayPort adapters really "shouldn't" exist. They are forcing the DisplayPort to run completely out-of-specification (effectively turning it into a DVI port). If you had a video card with ONLY DisplayPort on it, those would never work. And, one of the biggest drivers of DisplayPort in the first place was to allow the manufacturers to get out from under the DVI/HDMI payola issue. The DVI/HDMI spec is patent-encumbered, and to be able to use you have to pay both an annual and a per-unit licensing fee. DisplayPort is really a superior specification in many technical ways, as well. However, when you use it connected to a DVI monitor via one of those cheap adapters, you aren't really using DisplayPort. You are using DVI/HDMI through a DisplayPort connector. The video card vendor would still have had to pay up for each port, and would have had to include all of the extra resources that DVI requires.
That is part of the reason that DisplayPort monitors are more expensive. They are much more capable, but require more hardware. DVI is less capable, but requires this additional hardware to be built into the video card rather than the monitor... That's only part of the reason for the price, of course. Right now, most DisplayPort monitors are "premium" in other ways too. Since it is a newer standard, it is generally only included in the high-end models that have full compliments of port clusters, higher-quality panels, and other premium features.
That will change. Next year we will have MANY more DisplayPort models to choose from. The standard HAS been adopted by most of the big players in the computer hardware world. It is just new right now, so there is an economies of scale issue as well.
Looking at that video - BTW, big thanks Glynor, you were dead-on, I knew some of the details but not all - I'm not sure that is how I'd use a system with Eyefinity. The Start button on the left monitor at the bottom, and the close X for a window on the far right monitor at the top.... That idea works for games, but for other apps isn't it somewhat unnatural? (At least until they bring the very thin bezel monitors around...
Yes, this is one of the big problems with Eyefinity. It is really designed for gaming (and, perhaps, video-wall type displays). For standard desktop use, you'd really often be better off using three monitors in a standard extended desktop configuration, with UltraMon. That way the OS remains "aware" of the monitor boundaries, and can use them. Ideally in a few driver revisions, the drivers will provide an easy method to switch back and forth between the two modes. I'd like to game with all three monitors (and maybe sometimes play video scaled across them all), but for regular desktop use, I'd want the standard Windows Extended desktop functionality.