- Aug 25, 2001
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I really don't get this. I have a pair of 40" 4K UHD TVs I picked up on BF, Avera brand. They have four HDMI ports on them, and I believe that three, or possibly all four, are all HDMI2.0.
Anyways, all of my Polaris-based AMD graphics cards, have no problems driving them at full resolution and color depth (?), at 4K60.
Likewise, my NV cards will drive them fine, at 4K30. But when I switch the monitor to 60Hz refresh with my NV cards (currently using an GT1030 right now), the text, all the vertical lines get NTSC-like red- and blue-tinges.
This may be an issue with ClearText, and NV not bothering to put this TV into their database as to how they are supposed to be set up.
Or maybe NV cards really don't have HDMI2.0 ports like AMD Polaris cards do, and they just use over-driven HDMI1.4 hardware?
The reason that I say that is, I can use a GT730 card with HDMI1.4 ports, to drive my 4K UHD TVs at 4K60 as well, due to some sort of driver hack path that overdrives and reduces the color depth of the 4K signal, such that it can be driven with an HDMI1.4 port.
I can understand the reduced color depth, when using an HDMI1.4 port, but when using an NV card with a supposed HDMI2.0 port, I still experience that same loss of color depth at 4K60.
So, something strange is going on with NV cards. It may be a compatibility issue specific to my displays, in that AMD specifically tested and supports them, and NV didn't.
(I had something similar happen to me, with my Westinghouse 24" 1080P HDTVs that I was using before my 4K UHD TVs, there was an HDMI audio handshake issue with those displays, and it took a few months before both AMD and NV supported them properly. Before that, if the monitor went to sleep, if I woke it up, I wouldn't have audio.)
Anyways, all of my Polaris-based AMD graphics cards, have no problems driving them at full resolution and color depth (?), at 4K60.
Likewise, my NV cards will drive them fine, at 4K30. But when I switch the monitor to 60Hz refresh with my NV cards (currently using an GT1030 right now), the text, all the vertical lines get NTSC-like red- and blue-tinges.
This may be an issue with ClearText, and NV not bothering to put this TV into their database as to how they are supposed to be set up.
Or maybe NV cards really don't have HDMI2.0 ports like AMD Polaris cards do, and they just use over-driven HDMI1.4 hardware?
The reason that I say that is, I can use a GT730 card with HDMI1.4 ports, to drive my 4K UHD TVs at 4K60 as well, due to some sort of driver hack path that overdrives and reduces the color depth of the 4K signal, such that it can be driven with an HDMI1.4 port.
I can understand the reduced color depth, when using an HDMI1.4 port, but when using an NV card with a supposed HDMI2.0 port, I still experience that same loss of color depth at 4K60.
So, something strange is going on with NV cards. It may be a compatibility issue specific to my displays, in that AMD specifically tested and supports them, and NV didn't.
(I had something similar happen to me, with my Westinghouse 24" 1080P HDTVs that I was using before my 4K UHD TVs, there was an HDMI audio handshake issue with those displays, and it took a few months before both AMD and NV supported them properly. Before that, if the monitor went to sleep, if I woke it up, I wouldn't have audio.)