I guess this is what your after ??
Bitrate
1.62, 2.7, 5.4, or 8.1 Gbit/s data rate per lane; 1, 2, or 4 lanes; (effective total 5.184, 8.64, 17.28, or 25.92 Gbit/s for 4-lane link); 1 Mbit/s or 720 Mbit/s for the auxiliary channel.
Cable
3 meters for full bandwidth transmission over passive cable.
33 meters over active cable
https://en.wikipedia.org/wiki/DisplayPort
just to add
''Q: What is the data transfer bandwidth of DisplayPort 1.3?
A: By providing the option to support a new higher data transfer rate known as HBR3 (High Bit Rate 3), which provides a link rate of 8.1 Gbps per lane, DisplayPort 1.3 offers a 50% increase in total link rate to 32.4 Gbps when using all 4 lanes in the DisplayPort cable. Allowing for data coding overhead, this provides a total data transport capacity of 25.92 Gbps or 3240Mbytes/sec.''
http://www.displayport.org/faq/