How Has Nvidia Managed to Push 60Hz 4K Over HDMI 1.4?
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Nvidia has used an old trick to compress video images in order to get a 60 Hz 4K signal over the limited HDMI 1.4 interfaces on Kepler cards.
How Has Nvidia Managed to Push 60Hz 4K Over HDMI 1.4? : Read more
How Has Nvidia Managed to Push 60Hz 4K Over HDMI 1.4? : Read more
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Quarkzquarkz
June 23, 2014 8:25:36 AM
@WiseCracker, no not 75%. Keep in mind compression loss and resolution distortion are two completely different things. In this case, the sample packets are down from 4:4 to about half so you're essentially looking at a very poor 1440p. And not even 2k at that, you would expect a range between 1k and 2k and no one respects downsampling at any rate.
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elbert
June 23, 2014 8:36:56 AM
derekullo
June 23, 2014 9:36:03 AM
Ikepuska
June 23, 2014 11:16:49 AM
I object to the use of "a lot of video files are even encoded with the 4:2:0 preset in order to reduce the file size". In fact the use of chroma subsampling is a STANDARD and MOST video files including the ones on your commercially produced Blu-ray movies were encoded using it.
This is actually a really useful corner case for things like HTPCs or if you have a 50ft HDMI to your TV or projector, because there really is no loss of fidelity. But for desktop use it's just a gimmick.
This is actually a really useful corner case for things like HTPCs or if you have a 50ft HDMI to your TV or projector, because there really is no loss of fidelity. But for desktop use it's just a gimmick.
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Keyrock42
June 23, 2014 11:36:15 AM
Anyone hooking up a 4K TV or monitor really should do their research and make sure it has a display port input (why some 4k TVs or monitors are even manufactured without a display port input is beyond me). That said, it's nice that there is at least a dirty hack like this available for those that need to connect to a 4K TV/Monitor via HDMI. It's far from ideal, but better than nothing, I guess.
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thundervore
June 23, 2014 11:52:01 AM
Quote:
And so the moral of the story is don't buy a 4k TV / Monitor without display port.If using a computer monitor then yes, Display Port wins here at 4K but if connecting to a 4K TV then using Display Port is not an option as i have yet to see a TV with Display port.
edit:
Looks like they are making TVs with Dispaly port after all. Didnt think this was going to happen any time soon.
http://www.panasonic.com/au/consumer/tvs-projectors/led...
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sha7bot
June 23, 2014 1:37:01 PM
hannibal
June 23, 2014 1:56:11 PM
Blazer1985
June 23, 2014 6:15:21 PM
It is not about color precision, it is about color compression as someone noted. Since human eye is capable of noticing luma changes between 4 pixels but not so much for the color information. Proof is that you'll get 4:4:4 10bit only (almost) on cinema screens while the tv - documentaries are filmed in 4:2:2 8bit at most and anyway you see them (even movies) after a 4:2:0 compression. I could post some links about it but they would be so boring :-D
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hannibal
June 23, 2014 10:59:20 PM
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wuzelwazel
June 23, 2014 11:40:08 PM
I think most of this has been covered already but it's important enough to mention again.
The chroma in a video signal is far less important than the luma. Human vision is much much more sensitive to changes in brightness than changes in color. In addition there is no loss of color depth; only a loss in the resolution of the least important part of the signal. Also, the effective resolution of the chroma at 4:2:0 sampling on a 4K display is 1920x1080 which is by no means low resolution.
Of course 4:4:4 would be the best option but I'd call 4:2:0 a no-brainer to allow double the refresh rate for some users.
The chroma in a video signal is far less important than the luma. Human vision is much much more sensitive to changes in brightness than changes in color. In addition there is no loss of color depth; only a loss in the resolution of the least important part of the signal. Also, the effective resolution of the chroma at 4:2:0 sampling on a 4K display is 1920x1080 which is by no means low resolution.
Of course 4:4:4 would be the best option but I'd call 4:2:0 a no-brainer to allow double the refresh rate for some users.
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Draven35
June 24, 2014 1:05:03 AM
SteelCity1981
June 24, 2014 2:56:20 AM
nottorp
June 24, 2014 3:55:56 AM
geok1ng
June 24, 2014 5:08:17 AM
derekullo
June 24, 2014 9:56:57 AM
fuzzion
June 25, 2014 1:38:38 AM
ravewulf
June 25, 2014 2:26:33 AM
Draven35
June 25, 2014 5:18:21 AM
!