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Just came out where?
frisbfreek
https://www.club-3d.com/en/detail/2496/displayport_1.4_to_hdmi_4k120hz_hdr_active_adapter_m-f/
net200777
I thought you meant it was available for purchase. It’s not available yet
frisbfreek
End of the month, so soon enough? Anyway, still wondering more about the CAC-1585!
This says something about compression. You can’t get a true 4K 120 Hertz at 10 bit. You can however get 98 hz. I hope they haven’t compressed the signal
frisbfreek
Yes, you need DSC (display stream compression) to get beyond 4K@120hz@8bit or to get to 8K@60hz. DSC should be visually lossless though, and I’m curious to see proof of it.
No compression is 444
frisbfreek
4:4:4 is referring to the chroma sampling. DSC is totally different. All of the resolutions I mentioned would be at 4:4:4.
net200777
any type of compression is going to reduce quality. And yes I could tell the difference between 8-bit 4K 120 and 10-bit 4K 98
frisbfreek
You should do your research on DSC, and maybe compression algorithms in general, before making any judgments on compression quality. It’s totally orthogonal to chroma sub-sampling, bit depth, and frame rates.
Anyway, back to my original question, @MST1407, any indications as to when the CAC-1585 might come out?
net200777
Compression vs raw?
net200777
It’s not too much research needed
Monstieur
any type of compression is going to reduce quality. And yes I could tell the difference between 8-bit 4K 120 and 10-bit 4K 98
You cannot tell the difference between 8-bit with dithering YCbCr444 / RGB and 10-bit YCbCr444 / RGB in either HDR or SDR. However with YCbCr422 / YCbCr420 subsampling, you cannot use dithering and must use 10-bit for HDR.
MST1407
the CAC-1585 will have a later delivery time – around end of August
just curious what system do you want to connect it to? There arent that many USB C DisplayPort 1.4 Alt Mode solutions out there
frisbfreek
Thanks for the info! I was thinking that this adapter is targeted more at laptops that only have USB-C and no DisplayPort ports. Ice Lake supports DSC and DisplayPort 1.4, but I haven’t seen any info about Alt Mode. Tiger Lake is also coming out soon (probably similar August timeframe).
