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Old 30-01-2019, 19:36
Core i7 Core i7 is offline
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Join Date: 08-2008
Posts: 464
Re: decode 4k HDR 1 số thắc mắc ?

Originally Posted by longltt View Post
Vừa kiểm tra xong cắm DP từ rx580 thì dept bit (hình như là độ sâu màu thì phải) chỉ có 10 bit nhưng cắm cổng hdmi thì lên 12 bit, lên q/đ chọn sử dụng cổng HDMI là chuẩn nhất.
khả năng là cái Display Port trên monitor là version cũ.
Dell UltraSharp Monitor: U2518D

1 x DP (ver. 1.2)
1 x mDP (ver. 1.2)
1 x DP (ver. 1.2) out with MST
1 x HDMI (ver. 2.0)
1 x USB 3.0 port - Upstream
4 x USB 3.0 ports , including 2 x USB 3.0 BC1.2 charging capability at 2A (max)


"Nvidia revealed the GeForce GTX 1080, the world's first graphics card with DisplayPort 1.4 support on 6 May 2016. AMD followed with the Radeon RX 480 to support Displayport 1.3/1.4 on 29 June 2016. The Radeon RX 400 Series will support DisplayPort 1.3 HBR and HDR10, dropping the DVI connector(s) in the reference board design"

+Display Port Version:

"1.4 DisplayPort version 1.4 was published 1 March 2016. No new transmission modes are defined, so HBR3 (32.4 Gbit/s) as introduced in version 1.3 still remains as the highest available mode. DisplayPort 1.4 adds support for Display Stream Compression 1.2 (DSC), Forward Error Correction, HDR10 metadata defined in CTA-861.3, including static and dynamic metadata and the Rec. 2020 color space, for HDMI interoperability, and extends the maximum number of inline audio channels to 32.

DSC is a "visually lossless" encoding technique with up to a 3:1 compression ratio. Using DSC with HBR3 transmission rates, DisplayPort 1.4 can support 8K UHD (7680 × 4320) at 60 Hz with 30 bit/px RGB color and HDR, or 4K UHD (3840 × 2160) at 120 Hz with 30 bit/px RGB color and HDR. 4K at 60 Hz with 30 bit/px RGB color and HDR can be achieved without the need for DSC. On displays which do not support DSC, the maximum limits are unchanged from DisplayPort 1.3 (4K 120 Hz, 5K 60 Hz, 8K 30 Hz)."

+HDMI Version
Color Depth Support
1.4–1.4b 2.0–2.0b 2.1
Color Depth Support
8 bpc (24 bit/px) Yes
10 bpc (30 bit/px) Yes
12 bpc (36 bit/px) Yes
16 bpc (48 bit/px) Yes

Tóm lại, thường Display Port>HDMI>D-Sub (VGA) nhưng trong trường hợp có HDR thì cần 1 Display Port 1.3 hoặc 1.4 càng tốt :
Is DisplayPort better than HDMI?
"DisplayPort is a bit more versatile, but if your monitor only gives you the choice between HDMI 2.0 and DisplayPort 1.2—like this Pixio display does—HDMI may be the better choice, since HDMI 2.0 supports HDR and DisplayPort 1.2 does not."
(DisplayPort linh hoạt hơn một chút, nhưng nếu màn hình của bạn chỉ cung cấp cho bạn sự lựa chọn giữa HDMI 2.0 và DisplayPort 1.2 thì giống như màn hình Pixio này, HDMI HDMI có thể là lựa chọn tốt hơn, vì HDMI 2.0 hỗ trợ HDR và ​​DisplayPort 1.2 không. )
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