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Topic # 111461 4-Nov-2012 10:59
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For some reason, my elderly NVidia 9600GT card refuses to work via a 7.5 metre HDMI cable to my newly-purchased Panasonic Plasma TV.  Yet it will quite happily do so over a 1.5 metre or 2 metre cable.  When connected via the 7.5 metre cable, the card doesn't even detect the presence of the TV, much less display any video to it.  Even at the lowest available resolution of 640x480/60Hz, nothing happens.

The 7.5 metre cable is brand-new, purchased from Dynamix and compatible with the HDMI V1.4 spec.  My Vu+ Duo satelliute receiver connects to the TV via this same cable with no issues at 1080i/50Hz.  Therefore, the cable isn't the problem.

Which video cards have people successfully used with long HDMI cables?

I am thinking of buying a GTX 650 as it seems to tick all the boxes that I need, without being overkill.  It has a full-sized HDMI connector (rather than Mini-HDMI) and has a large heatsink with equally large diameter fan, therefore should be quiet:

http://www.playtech.co.nz/afawcs0139235/CATID=762/ID=18797/SID=845461558/productdetails.html

From past experience, I prefer NVidia cards, but will look at ATI if there is some compelling reason.  It seems as though all recent cards support audio over HDMI, and this would certainly be nice to have.  The so-called "new generation" 610/620/630 cards seem to be rebadged versions using earlier chipsets, and may be little better than my existing 9600GT.  Therefore, either GT 640 or GTX 650 look like good choices for a PC which spends most of its time working standalone into a 27" monitor, and occasionally as a HTPC using BBC iPlayer or VLC Player to view content on my new TV.

If there are no Video Cards which will work via a 7.5 metre HDMI cable, I guess I will need to buy an HDMI extender of some sort.

Any and all suggestions/comments would be much appreciated.





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  Reply # 711683 4-Nov-2012 11:49
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I have a ATI HD 3870 and it works fine with 10m of HDMI cable carrying audio



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  Reply # 711866 4-Nov-2012 19:17
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Thanks BJ17. It looks like that card is no longer available, but good to know someone is using a 10 metre cable without any problems.





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  Reply # 711870 4-Nov-2012 19:20
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I had a HD 7750 in my old Server, had it connected to my plasma with a 10m HDMI cable, had no issues at all :)

EDIT:  Also, I have used that 10m HDMI cable from my old HP Laptop with a HD 2600M.  No issues.




 

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  Reply # 711880 4-Nov-2012 19:55
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My laptop has an Nvidia GeForce 9600M GT graphics card in it. I run the HDMI out to a Sony KDL-46EX720 via a 10m HDMI on a semi-regular basis with no issues whatsoever...except when I forget to change the audio output :-)



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  Reply # 711896 4-Nov-2012 20:45
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Many Thanks people!

It looks like my 9600GT has developed a fault and should be replaced ASAP.
Going from your experiences, it seems that an HDMI extender won't be necessary, which is welcome news.





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  Reply # 711957 4-Nov-2012 23:14
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I have a 9600M GT on my laptop, and have a 10 metre total length HDMI cable which comprises of 2 x 5m lengths joined with an HDMI female-to-female joiner, which goes to a TV.

It all works fine.

Just thought I'd add that confirmation to the mix to help you with your troubleshooting.

Hope it helps. :)

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  Reply # 713121 6-Nov-2012 19:55
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I have dropouts all the time on a 5m cable from my nvidia card to a coupler HDMI plate then a 30cm cable to the wall mounted screen.

its the i2c data lines failing because the screen is showing as removed and then will come back again, if the LVDS signals are failing then you will get detection but a total mess of display.

But, if I used the DVI port on the card with an adapter to HDMI, it worked reliably, not even glitching when I turned the fluro lights on/off or used nasty noisy power tools. But thats not a solution as I need the DVI free to use a VGA adapter on for my other antique monitor.




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  Reply # 713125 6-Nov-2012 20:04
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I have had this problem before with long cables and swapping cables sometimes worked

don't ask why it works on one device and not the other and swapping cables worked



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  Reply # 713150 6-Nov-2012 20:49
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richms: I have dropouts all the time on a 5m cable from my nvidia card to a coupler HDMI plate then a 30cm cable to the wall mounted screen.

its the i2c data lines failing because the screen is showing as removed and then will come back again, if the LVDS signals are failing then you will get detection but a total mess of display.

But, if I used the DVI port on the card with an adapter to HDMI, it worked reliably, not even glitching when I turned the fluro lights on/off or used nasty noisy power tools. But thats not a solution as I need the DVI free to use a VGA adapter on for my other antique monitor.

Thanks for those further comments RichMS.  It seems crazy that they used I2C for the DDC link to an HDMI monitor.  It is a very noise-sensitive protocol intended for use within the boundaries of a single circuit board, not over any distance at all.  Surely the engineers who designed HDMI should have used some form of differential signalling e.g. RS-485.  This would have worked at up to 1.2km instead of just a few metres!

The GTX 650 card I am planning to buy has 2 x DVI, 1 x HDMI and 1 x VGA port so I will be spoilt for choice.  I have an NVidia DVI to HDMI adaptor which works fine on the existing card with a 1.5 metre cable.  But when teamed up with the 7.5 metre, Nada.

So I will have the choice of connecting directly HDMI - Cable - TV ... or ... DVI - HDMI - Cable - TV.
With any luck, one of those options should work!





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