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Why is HDMI worse than DVI on the same monitor?

post #1 of 15
Thread Starter 
In sum;

- Just bought a 2nd ASUS VS238H-P monitor
- Original one uses DVI-D to connect
- Sold out of DVI cables at work, so grabbed a DVI>HDMI instead
- Plugged into my 670 and the pictures look completely different, like night and day (even after reseting monitor settings)
- DVI looks much better to me
- Verified it was the HDMI cable by trying an HDMI>HDMI instead (still crap picture) and then a DVI>DVI cable (fixed everything)

Craziest part of this? While playing LoL on the monitor using DVI, consistent 60fps. Same monitor using HDMI, ~30fps. Same test conditions

What gives? I know my 670 can handle dual monitors no problem, and I only notice problems using HDMI (which I again verified by using HDMI on the original monitor, giving same ****ty quality). I will be buying a DVI cable tomorrow to alleviate my problem, but now I am curious as to why this is happening. So any thoughts OCN?
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post #2 of 15
probably the cable is of bad quality or doesn't have enough bandwidth

you should try another hdmi cable from monoprice, amazing cable quality for low price
    
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post #3 of 15
Since HDMI and DVI use IDENTICAL signals, with the exception being audio on HDMI, my only guess would be to check the underscan and overscan, but it almost sounds as if one of your ports is faulty...
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post #4 of 15
Quote:
Originally Posted by Germanian View Post

probably the cable is of bad quality or doesn't have enough bandwidth

A cable that cost 99 cents is just as good as one that costs 200 bucks, its digital, as long as it gets there it should look the same.
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post #5 of 15
well, dual-link DVI has more "bandwidth" I think, since you need one to run a 120hz monitor...but I don't think the OP model is 120hz right? so, shoot, I'm not sure...make sure overscan or scaling settings are accurate, I know I have to do that for my HDMI-connected monitor sometimes, but never for my DVI/display port-connected monitors
post #6 of 15
Quote:
Originally Posted by flash2021 View Post

well, dual-link DVI has more "bandwidth" I think, since you need one to run a 120hz monitor...but I don't think the OP model is 120hz right? so, shoot, I'm not sure...make sure overscan or scaling settings are accurate, I know I have to do that for my HDMI-connected monitor sometimes, but never for my DVI/display port-connected monitors

Yes, dual link DVI does have more bandwidth, but AFAIK HDMI has a very high bandwidth to begin with and since it can easily run your run of the mill 120hz HDTV it shouldnt be an issue.

Pulled from Wikipedia:

"Dual-link DVI

To support display devices requiring higher video bandwidth, there is provision for a dual DVI link. A dual link doubles the number of TMDS pairs, effectively doubling video bandwidth at a given pixel clock frequency."

Version 1.4 HDMI has a typical bandwidth of 10.2Gb/s if you include overhead...

And yes, HDMI devices have a tendency to not scale correctly without adjusting
Edited by raidmaxGuy - 3/5/13 at 8:04pm
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post #7 of 15
Thread Starter 
Monitor can only support 60hz so no problem there. Cable was a monster hdmi cable (no I would never pay retail, best buy discount) so not lacking quality. Doubt its the port cuz I use the dvi out on my 670 and plug in thru hdmi. Tried reversing it and still same problems. Ill check the overscan when I get home but doubt that would mess up the color pallet as well
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post #8 of 15
The first thought I get when reading something like this happening on a Nvidia card is the sad default RGB setting in the Nvidia control panel. By default, Nvidia uses the limited RGB setting suitable for most TV's with their default settings. When you connect it to a monitor in stead, the result is a completely washed out image with no deep colours and poor contrast. The remedy? Change the color format from RGB to YCbCr444. This is a really common problem and seems like the number one reason why some people complain about the image quality of Nvidia cards nowadays.
Warning: Spoiler! (Click to show)

Edited by specopsFI - 3/6/13 at 4:56am
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post #9 of 15
Quote:
Originally Posted by specopsFI View Post

The first thought I get when reading something like this happening on a Nvidia card is the sad default RGB setting in the Nvidia control panel. By default, Nvidia uses the limited RGB setting suitable for most TV's with their default settings. When you connect it to a monitor in stead, the result is a completely washed out image with no deep colours and poor contrast. The remedy? Change the color format from RGB to YCbCr444. This is a really common problem and seems like the number one reason why some people complain about the image quality of Nvidia cards nowadays.

 

How do you change to YCbCr444?

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post #10 of 15
Quote:
Originally Posted by TwoCables View Post

How do you change to YCbCr444?

Edited to the previous post as a screen capture. smile.gif
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