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2011/8/7 Shirley M?rquez D?lcey <mark at buttery.org>: >> Recent high-end Radeon and NVidia video cards tend to come with >> DisplayPort, too. > > I haven't seen that; the ones I've seen come with HDMI rather than > DisplayPort. That doesn't mean that all of them do, but if I'm spending I'd > rather have an HDMI port. DisplayPort never really caught on with anybody > other than Apple, and it strikes me as a standard that has no good reason > for existence; what technical advantage does it have over the more widely > adopted HDMI? (I'm prepared to be enlightened if it actually has one.) DP has two main differences compared to HDMI, one non-technical and one technical: 1. DP is an open royalty-free standard supported by VESA, HDMI has royalties per connector. One is free to extend the DP standard for customized applications (e.g. embedded markets) 2. DP allows for a 720Mbps AUX channel that could be used for data transfer. Most practical use is for touchscreens, DPMS and for using it for USB data (think USB hubs in the monitor without needing a separate USB cable). HDMI allows for a relatively low-speed "Consumer Electronics Control" channel and is used by several consumer electronics vendors for vendor-specific remote controls (e.g. Sony BluRay player talking to Sony TV or Sony A/V receiver). DP also supports multiple audio/video streams over the same cable. Practically, you'll find most computer/graphics card vendors supporting both DP & HDMI, though some may have only DP ports and ask you to buy a separate DP -> HDMI dongle to connect to your TV (thus passing the HDMI royalty fee to the dongle). IMHO, the DP connector is more robust compared to HDMI. A point to note is that both standards are continually evolving, and the technical differences between the two are getting blurred with each revision. Hope this helps, Shankar
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