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Thunderbolt is based on the Mini DisplayPort connector developed by Apple. This is electrically identical to "normal" DisplayPort connectors, but uses a smaller connector that is more suitable for use on laptops and other consumer devices. It is expected that Thunderbolt's use of this connector will drive wider acceptance.
Because the PCIe bus does not carry video data, it is unclear whether a standalone PCIe card could offer a Thunderbolt port. The Intel Thunderbolt Technology Brief does not give a conclusive answer.Intel disclosed documentation where video stream is sent to a dual-thunderbolt controller, with the video stream being only sent to one of the Thunderbolt Port, giving the assumption that video stream is not mandatory on Thunderbolt implementation.
Thunderbolt can be implemented on PCIe graphics cards, which have access to DisplayPort data and PCI express connectivity, or on the motherboard of new devices, such as the MacBook Pro.Thunderbolt controllers on the host and peripherals fold the PCIe and DisplayPort data together and unfold them after they exit the cable.
Thunderbolt is interoperable with [DisplayPort] 1.2 compatible devices. When connected to a DisplayPort compatible device the Thunderbolt port can provide a native DisplayPort signal with 4 lanes of output data at no more than 5.4 Gbit/s per lane. When connected to a Thunderbolt device the per-lane data rate becomes 10 Gbit/s and the 4 lanes are configured as 2 channels with each bidirectional 10 Gbit/s channel comprising one lane of input and one lane of output.


Detailed Product Description

1.  The ultrafast and ultra flexible data transmission
     between your PC and peripheral and display devices
     up to 10 Gbps.
 2.  Up to 20 times faster than with USB 2.0
 3.  Up to 12 times faster than with FireWire 800
 4.  Transfer a full-length HD movie in less than 30 seconds
 5.  Back up one year of continuous MP3 playback in just
     over  10 minutes
 6.  Supports DisplayPort, DVI, HDMI, and VGA displays.