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Tim M

4х4K Capture

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Hi Everyone, we have such case:

4 outputs 3840x2160 60Hz and 4 inputs 3840x2160 60Hz 

Hardware: X99, Intel i7 5930K, 16Gb DDR4, 2xSSD RAID0, WX7100

For capturing we want to use 

Datapath SC-HD4+ x2 (HDMI 1.4)

or

Magewell Pro Capture HDMI 4K Plus x4 (HDMI 2.0)

 

What are you thinking about simultaneous work of cards and latency time?

 

 

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In the first place, BEFORE you buy, you should clear up an anomaly with Datapath re their Datapath SC-HD4+. The specs say Ch 1 & 2 support 3840x2160 at 60Hz, but the pdf fact sheet in the description write up states two channels support 3840x2160 at 30Hz.

 

In my own tests recently with a Philips UHD monitor, I could not get 60Hz with HDMI 1.4. Upped the DP-HDMI adapter to HDMI 2.0 and voila!...3840x2160 at 60Hz!!...and action video (a soccer match between Barcelona and Atletico Madrid obtained from the internet) was much much smoother.

 

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Tim, another thing you have to consider is, if nothing changed until now, AMD cards only can get up to 3x4K outputs due to a issue with the driver.

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On a Windows 7 machine you are limited, as Quim says, to 3x4K outputs. But on Windows 10 that is not a problem with the AMD drivers anymore. 

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Thank you for your answers!

On 5/1/2018 at 9:12 PM, Thomas Leong said:

In the first place, BEFORE you buy, you should clear up an anomaly with Datapath re their Datapath SC-HD4+. The specs say Ch 1 & 2 support 3840x2160 at 60Hz, but the pdf fact sheet in the description write up states two channels support 3840x2160 at 30Hz.

 

In my own tests recently with a Philips UHD monitor, I could not get 60Hz with HDMI 1.4. Upped the DP-HDMI adapter to HDMI 2.0 and voila!...3840x2160 at 60Hz!!...and action video (a soccer match between Barcelona and Atletico Madrid obtained from the internet) was much much smoother.

 

Thanks, I asked Datapath's support, but in any case I tend to Magewell cards.

On 5/2/2018 at 1:54 PM, DavidA said:

On a Windows 7 machine you are limited, as Quim says, to 3x4K outputs. But on Windows 10 that is not a problem with the AMD drivers anymore. 

Yes, I know, thank you, David

In this case, I am most worried about the simultaneous work.

 

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Hi!

Here is Datapath support answer about VisionSC-HD4+:

The VisionSC-HD4+ is HDMI 1.4 capable so according to this the maximum capture resolution would be [email protected]

However, for Inputs 1&3 we have added support for [email protected] using reduced colour format only (Chroma subsampling YUV 420)

 

Any other ideas about 4x4K capture cards?

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Well I would say if you can wait then go for the new Newtek HDMI 2.0 NDI converter box and buy 4 of them.

If you need something now go for the Decklink 8K which has 4 12G SDI Inputs and put a simple HDMI to 12 G converter in front of it.

For handling 4x4K inputs I wouldprefer a WX 9100 which give you a lot more overhead but I would give it a try first...

 

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