Some Graphics card manufacturers claim 10 bit per channel output via DVI such as the ATIX1900 series (PC and Mac)Avivo™ Video and Display Platform
High performance programmable video processor
Accelerated MPEG-2, MPEG-4, DivX, WMV9, VC-1, and H.264 decoding and transcoding
DXVA support
De-blocking and noise reduction filtering
Motion compensation, IDCT, DCT and color space conversion
Vector adaptive per-pixel de-interlacing
3:2 pulldown (frame rate conversion)
Seamless integration of pixel shaders with video in real time
HDR tone mapping acceleration
Maps any input format to 10 bit per channel output
Flexible display support
Dual integrated dual-link DVI transmitters
DVI 1.0 compliant / HDMI interoperable and HDCP ready*
Dual integrated 10 bit per channel 400 MHz DACs
16 bit per channel floating point HDR and 10 bit per channel DVI output
Programmable piecewise linear gamma correction, color correction, and color space conversion (10 bits per color)
Complete, independent color controls and video overlays for each display
High quality pre- and post-scaling engines, with underscan support for all outputs
Content-adaptive de-flicker filtering for interlaced displays
Xilleon™ TV encoder for high quality analog output
YPrPb component output for direct drive of HDTV displays
Spatial/temporal dithering enables 10-bit color quality on 8-bit and 6-bit displays
Fast, glitch-free mode switching
VGA mode support on all outputs
Drive two displays simultaneously with independent resolutions and refresh rates
The ATI 4870 HD claims full 30 bit display output via mini display port/dvi (Mac/PC)
http://ati.amd.com/products/Radeonhd4800/specs3.htmlATI Fire Pro V5700 line claims 8, 10 amd 16 bit per color output via Display port (PC)
http://www.amd.com/us/products/workstation...5700-specs.aspxThen there is the NVIDIA Quadro CX claims 30 bit output via Display Port and optimized for Adobe CS4(PC) hopefully we will see a MAc option
http://www.nvidia.com/object/product_quadro_cx_us.htmlNVIDIA currently makes the dual link DVI Quadro FX4800 for Mac Pro but I could not find information about color output
http://www.nvidia.com/object/product_quadr...for_mac_us.html