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HDMI output to Display Port input--is it possible?????

I'm trying to connect a new monitor with a Display Port input to an older computer whose graphics card has an HDMI output. I bought an adapter but it doesn't work. I know you can do it the other way around--DP output to HDMI input--but am I attempting the impossible? Or do I have a faulty adapter or HDMI cable? I believe the graphics card is Nvidia GeForce 9800 GT, although it looks different from the picture I see online. It has three outputs, DVI, VGA and HDMI, while the one in the picture has two DVI outputs and one HDMI output.

The monitor works fine with the DVI connection, but am I missing a performance difference that makes troubleshooting and/or buying a newer graphics card worthwhile?
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pmerrion
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pmerrion
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_Commented:
You are probably going to need a converter, for this to work correctly.
For example: http://www.newegg.com/Product/Product.aspx?Item=N82E16815158264&nm_mc=KNC-GoogleAdwords&cm_mmc=KNC-GoogleAdwords-_-pla-_-Audio+Video+Converters-_-N82E16815158264&gclid=CJefmfD_oLcCFScV7Aod9l0Aew

SKE4096's post on June 5, 2012   6:13:48 AM has a good take on why:
http://www.tomshardware.com/forum/64251-3-hdmi-display-port


>> ...but am I missing a performance difference...

Not really.
http://www.tomshardware.com/forum/367527-33-hdmi
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pgm554Commented:
The differences between the video output of HDMI and DVI is negligible.

Where the major differences lay are that HDMI is encrypted between devices and that audio is bundled in with the signal.

If all you want is high quality video,DVI  is a no brainer.
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_Commented:
Thank you much.     : )
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