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GTX 480 maxes out at 1920X1080 over HDMI, but 2560X1440 is OK over DVI and adapter to HDMI

post #1 of 8
Thread Starter 
I'm testing out my new Auria EQ276W 27" 2560X1440 monitor this week with my Evga GTX 480. It will only display a max of 1920X1080 using the mini HDMI port, that uses a supplied mini to full size HDMI cable.

Using the DVI ports, and dual link DVI cables, I get the full resolution.

Now, I also tried using an old AMD DVI to HDMI adapter, and I get full resolution with the HDMI cable. I'm using the same HDMI cable to test these ports.

Shouldn't the HDMI port also display 2560X1440? I've seen plenty of aruments on the web of limited bandwidth with HDMI, but my understanding is HDMI is fine for 2560x1440.

I can use the DVI to HDMI adapter if I must, unless there is some performance loss by doing so. I would prefer to use just a straight HDMI all the way, but it looks like it can't do it even though Evga says it's a HDMI 1.3 version.

Any ideas on this?

Thanks
Edited by Geezerman - 11/14/12 at 10:16pm
post #2 of 8
You sure the monitor supports HDMI 1.3? Both ends would have to support it for it to work.

Edit: Looks like it doesn't - this is from the product page:
Quote:
To achieve the maximum resolution of 2560 x 1440, a DisplayPort or DVI port must be used on both ends.
post #3 of 8
Thread Starter 
Yeah, but with a DVI to HDMI adapter on the video card and using a HDMI cable to the HDMI port on the monitor I get 2560X1440. Using the same HDMI port on the monitor, but switching to the HDMI port on the video card I only get 1920X1080
post #4 of 8
Oh, I thought you had the adapter on the other end. Same cable for all these tests right? So it's not a cable problem? Maybe the mini-HDMI to HDMI adapter is the issue. Or maybe it is a problem where the GPU thinks the monitor is not HDMI 1.3 for some reason - I think the HDMI connection is bi-directional but DVI-HDMI would not be. In any case, no loss of performance or anything with using the DVI-HDMI adapter, since they are electrically the same.
Edited by Forceman - 11/14/12 at 11:00pm
post #5 of 8
Thread Starter 
Quote:
Originally Posted by Forceman View Post

Oh, I thought you had the adapter on the other end. Same cable for all these tests right? So it's not a cable problem? Maybe the mini-HDMI to HDMI adapter is the issue. Or maybe it is a problem where the GPU thinks the monitor is not HDMI 1.3 for some reaosn (not sure if that connection is bi-directional or not). In any case, no loss of performance or anything with using the DVI-HDMI adapter, since they are electrically the same.

Yeah, same cable used for all testing.

I'm thinking of a scenario where the monitor tells the card via HDMI and EDID that it's max resolution is 1920X1080 because the manufacturer has not rated it HDMI version 1.3 But when using a DVI to HDMI adapter , the EDID info does not get relayed correctly.
Edited by Geezerman - 11/14/12 at 11:08pm
post #6 of 8
Quote:
Originally Posted by Geezerman View Post

Yeah, same cable used for all testing.
I'm thinking of a scenario where the monitor tells the card via HDMI and EDID that it's max resolution is 1920X1080 because the manufacturer has not rated it HDMI version 1.3 But when using a DVI to HDMI adapter , the EDID info does not get relayed correctly.

That's what I think too. That data would get lost when going DVI-HDMI so then you can set whatever you want. Isn't there a way in the Nvidia control panel to override EDID and set the higher resolution anyway - might be worth trying that.

Edit: Nvidia Control Panel - Change Resolution - Customize - "Enable resolutions not exposed by the display"
Edited by Forceman - 11/14/12 at 11:24pm
post #7 of 8
Thread Starter 
I'm moving this discussion to the Enkay's Mini Review of the AURIA EQ276W thread here since it has many Auria users there..
post #8 of 8
Thread Starter 
and thanks for your thoughts on this Forceman....
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