To put it simply, AMD supports HD3D only through HDMI 1.4a or DP with monitors that are listed on their support pages. DVI-D is only supported by Nvidia 3D Vision, and it in turn doesn't support DP (but does HDMI 1.4a through 3D TV Play! or what the heck was it called..).
As previously mentioned in this thread, this means the Samsung monitors only support AMD's 3D implementation, and they come with Tridef drivers. Not even the 950D that comes with DVI-D supports 3D Vision. It's simply up to Nvidia and AMD to decide what monitors they support. If it don't got Nvidia 3D Vision sticker in it, the monitor won't do 3D Vision. Even AMD HD3D didn't work with 750D before AMD updated their drivers to support it.
Another surprise for AMD HD3D users is probably that CrossFire isn't supported in 3D mode. I think AMD stated they're working on it, but at the moment it's a negative for HD3D.
With new tech from either Nvidia or AMD you shouldn't assume anything is really working. It makes an ASS
out of U