It looks like the AMD FirePro W5000 DVI could possibly do the trick. One thing I'm not clear on is how packed pixel mode effects maximum resolution. If I understand it correctly, packed pixel mode just refers to the technology AMD is using to push more color information per pixel. So when the description of the card says:
- Maximum resolution 2560 x 2048 at 60Hz with packed pixel mode
I'm assuming that is per output? Could it handle two 2160x2048 outputs (one on each DVI port?) And I'm also wondering if the output NEEDS to be a packed pixel display - mine is definitely not.