DisplayPort 1.4 to HDMI 2.1 4k 60p 10-bit 4:4:4 ?

Discussion in 'Videocards - NVIDIA GeForce' started by dfsdfs1112, Dec 24, 2019.

  1. dfsdfs1112

    dfsdfs1112 Active Member

    Messages:
    87
    Likes Received:
    3
    GPU:
    480
    Is there any solutions to get 4k 60p 10-bit 4:4:4 (RGB) on a HDMI 2.1 TV (LG C9) from a PC right now?

    HDMI 2.0 does not have enought bandwidth to support 10bit with 4:4:4 chroma at 4k 60p as far as I know. Is there any adapter/cable which would convert the display port of the GPU (1080ti in my case) to HDMI?

    I read somewhere that they are working on a DP 1.4 to HDMI 2.1 adapter, but no info since then,
     
  2. dfsdfs1112

    dfsdfs1112 Active Member

    Messages:
    87
    Likes Received:
    3
    GPU:
    480
  3. janos666

    janos666 Master Guru

    Messages:
    754
    Likes Received:
    74
    GPU:
    MSI RTX2060 6Gb
    Fun fact: G-Sync now works through a passive DisplayPort->HDMI adapter (RTX2060 with 450.12, the adapter a 1$ no-name Chinese gadget), although it's limited to 1080p60 RGB (the driver imposes a very low pixelclock limit for these kind of adapters).

    I am not aware if similar adapters with higher bandwidth limit are available (HDMI 2.0 capable versions exist but can only be found integrated to PCBs, not standalone in similar external adapters and I am not aware if HDMI 2.1 capable versions exist at all).

    It would be interesting to check if this works with Pascal cards (the original argument about the HDMI port limitations of Pascal won't hold for the DisplayPort).

    Edit: Huh! I managed to add 2160p60 as custom resolution and it works (at least with "reduced blanking", the image was fuzzy with "automatic" timings)! :)
     
    Last edited: Jan 26, 2020
  4. Astyanax

    Astyanax Ancient Guru

    Messages:
    4,735
    Likes Received:
    1,403
    GPU:
    GTX 1080ti
    if its a hdmi vrr display, then any of the ports that can operate in hdmi mode can do it.
     

  5. janos666

    janos666 Master Guru

    Messages:
    754
    Likes Received:
    74
    GPU:
    MSI RTX2060 6Gb
    It's an LG C9 (HDMI 2.1 VRR compatible OLED TV with G-Sync Compatible certification). I had to use "pixel clock patcher" to get above 1080p60. This is supposed to be a DP -> HDMI 1.x adapter but it can handle 2160p60 RGB just fine. :)
    However, 2160p100 or 120 still results in "No Input" error (may be the TV's current firmware isn't ready for that, HDMI 2.1 hardware or not).

    I sold my GTX1070 and bought an RTX2060 because this didn't work the last time I tried. I remember checking this with the Turing card for fun while I still had the GTX1070 and it didn't seem to work. That's why I think this is something new in recent (beta) drivers.
    I will be really mad about selling the GTX1070 Sea Harw EK X for a stupid air cooled RTX2060 if G-Sync would now work on this TV with this adapter (and the 1070's DP output). :( :(

    ALLM works as well but HDR10 doesn't.
     
    Last edited: Jan 26, 2020
  6. angelgraves13

    angelgraves13 Ancient Guru

    Messages:
    1,670
    Likes Received:
    411
    GPU:
    RTX 2080 Ti FE
    Doesn't Turing support HDMI 2.1 now?
     
  7. Mda400

    Mda400 Master Guru

    Messages:
    781
    Likes Received:
    58
    GPU:
    1660 - 2130/10ghz
    No graphics card to date, supports the full feature set of HDMI 2.1.

    When one supports it, i will be upgrading my HDTV and audio receiver to take advantage of 4k@120hz.
     

Share This Page