DisplayPort 1.2 bandwidth
Update: presentation from the CES 2009 Press Event
http://www.displayport.org/news-present ... _v3_09.pdfFew key points:
- multiple independent video streams
- doubling of the effective bandwidth to 17.3 Gbit/s
- AUX channel bandwidth increases to host bi-drectional USB
In summary, DP 1.2 is able to host
- two (L-R) 2560x1600 60 Hz video streams (or a single 1600p120 stream) at 30 bpp color;
- one 3840x2160 60 Hz 30 bpp stream, or
- four 1920x1600 60 Hz or 1080p60 streams at 24 bpp , etc.
over a single cable.
PS. For comparison, sample bandwidth required by certain resolutions, color depths, refresh rates and blanking methods, in Gigabit/s:
Code:
No blank GTF CVT CVT-RB (1)
60Hz 24 bpp
1920 1080 2.99 4.15 4.15 3.33
1920 1200 3.32 4.64 4.65 3.70
2560 1600 5.90 8.36 8.37 6.45
3840 2160 11.94 17.10 17.11 12.80
60Hz 30 bpp
1920 1080 3.73 5.18 5.19 4.16
1920 1200 4.15 5.79 5.81 4.62
2560 1600 7.37 10.44 10.46 8.06
3840 2160 14.93 21.37 21.39 16.00
120Hz 18 bpp
1920 1080 4.48 6.22 6.65 5.14
1920 1200 4.98 6.95 7.39 5.71
2560 1600 8.85 13.27 13.23 10.08
3840 2160 17.92 27.03 26.97 19.76
120Hz 24 bpp
1920 1080 5.97 8.29 8.87 6.85
1920 1200 6.64 9.27 9.86 7.61
2560 1600 11.80 17.69 17.64 13.43
120Hz 30 bpp
1920 1080 7.46 10.37 11.09 8.57
1920 1200 8.29 11.59 12.32 9.52
2560 1600 14.75 22.11 22.05 16.79
Note 1. CVT Reduced blanking as currenly defined by VESA only applies to 60 Hz signals, so 120 Hz with reduced blanking will need additional specifiation and testing updates.
Note 2. When directly driving a slim (cuircuit-less) 120 Hz monitor, the video card will probably have to dither down to 18 bpp, as current TN+film panels are only capaple of 6 bits per RGB color component.
See also
this post for HDMI 1.3 and DVI discussion.
