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Why does my GPU not allow me to select higher resolutions?


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#1 Ishta2000

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Posted 21 March 2015 - 11:09 AM

So I recently purchased a Sony 4K TV and I cannot figure out why my Video Card will only allow me to display 1920 x 1080. I know the card can go higher as I used to use a Dell 30 Inch monitor and could display the highest resolution on it.

 

My video card is a Radeon HD7800 card with 2 GB of RAM. I am using a HDMI 1.4 cable through my Onkyo receiver which also has up-scale capabilities but yet the maximum resolution I am getting on the TV is only 1080p.

 

Any suggestions would be great appreciated.

 

Cheers

 

 


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#2 Nich...

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Posted 21 March 2015 - 02:32 PM

Is HDMI 1.4 capable of more than 1080p?


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#3 Ishta2000

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Posted 21 March 2015 - 03:39 PM

Is HDMI 1.4 capable of more than 1080p?

 

As far as I am aware it is. I read an article on-line about it and apparently as long as the devices are able to do it then it should not restrict it. Besides current HDMI out puts to a Monitor would give higher resolutions I would think, or am I wrong?


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#4 Nich...

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Posted 21 March 2015 - 03:50 PM

A friend's laptop was putting out (via HDMI) 1080p to his brand new Dell 27" monitor that was capable of 1440p.  I thought it was comical, he didn't mind because it was still an upgrade.

 

If cable/screen/output are all capable of a new enough version of  HDMI, then I'm  not sure.


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#5 Rybags

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Posted 21 March 2015 - 04:47 PM

Resolution comes down to available bandwidth insofar as the interface goes, lower framerate or interlace allows higher than high framerate+progressive.

Possibly since it's a TV it doesn't give identification like monitors usually do.  Possibly it's a graphics card driver issue.  Sometimes there'll be a checkbox to allow selecting modes not supported by your device.  In the case of the CCC I have installed, there's an option to add HDTV modes which aren't present, so it's worth a look around.



#6 Mordenakhnen

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Posted 21 March 2015 - 09:46 PM

Is your HDMI cable labelled as high speed?

 

from wikipedia:

 

As of the HDMI 1.4 specification, these are the following cable types defined for HDMI in general:[113][114]

  • Standard HDMI Cable – up to 1080i and 720p
  • Standard HDMI Cable with Ethernet
  • Automotive HDMI Cable
  • High Speed HDMI Cable – 1080p, 4K, 3D and deep color
  • High Speed HDMI Cable with Ethernet

 

http://en.wikipedia....iki/HDMI#Cables

 

 


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#7 cleadge

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Posted 24 March 2015 - 08:55 AM

Tried bypassing your receiver?


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#8 Ishta2000

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Posted 24 March 2015 - 11:43 AM

Tried bypassing your receiver?

Yeah I have. Plugged HDMI version 1.4 straight into the TV and still max resolution is 1920 x 1080. Am stumped now.

 

I checked the GPU specs and it says it can handle 4K content and max resolution of 4096 x 2160.

 

Not sure where to go from here.

 

Thanks for all the replies so far too.

 

Cheers


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