I know there are video cards that display True Color (24 bit color), but are there any video cards that display Deep Color (30, 36 and 48 bit color)?
Further-more are there any display devices that can handle Deep Color?
The ATI FireGL™ 3D Workstation Graphics Accelerators support 16-bit per RGB channel (48-bit color). "Beyond true color" video is typically used for HDRI applications (high dynamic range imaging).
Microsoft announced that color depths of 30-bit and 48-bit would be supported in Windows 7 if you have a video card that supports 48-bit color and a monitor that supports 48-bit color using hdmi 1.3.
Here are a few articles I found about monitors supporting HDR and 48-bit images: