NVIDIA Pixel Clock Patcher

[Margatroid]

(12-09-2020 10:03 PM)ToastyX Wrote:  

(12-09-2020 08:57 PM)Margatroid Wrote:  Hey, just wanted to share a couple issues I have with 1.4.13. I just got a 3080 this week, and I'm using it with my old Overlord 1440 monitor with an Startech Displayport to Dual Link DVI Active adapter. I'm also using an LG C9. I found that the pixel clock patcher unfortunately seems to break the way the drivers work with the C9--I could get 4k 120hz to work, but whenever I tried to switch to another resolution or refresh rate I would just get a black screen. Undoing the patch fixed this. I also had issues where if restarted my video drivers on the Overlord monitor with the patch installed, I got stuck on a black screen and had to restart Windows.

Also, the patcher unfortunately does not even allow me to use 120hz on the Overlord monitor. I made a setting for 64hz which works, but 120 won't show up on the drop-down menu options under advanced display properties. So it seems this patcher just isn't working at all with RTX series cards, at least not on the driver I'm using, which is 457.51.

Do you think maybe the DisplayPort to DVI-D adapter is causing problems? I've read in reviews that other people have been able to get 1440 120hz with it, but I wonder if somehow it's preventing Windows from recognizing that my specific monitor can do 120hz. In any case, it seems like this version of the patcher isn't going to work with current RTX drivers because of the blackscreen issues.

The patcher does not affect DisplayPort limits. I don't know why it's affecting the C9 because the patcher doesn't change any HDMI 2.x limits, but you shouldn't need the patcher with that adapter anyway. You have to keep the pixel clock under 476 MHz, and that's with 6 bpc color. The limit for 8 bpc color is 357 MHz.

No, I don't need the patcher with the C9, but I do need to use it if I want to still be able to run the other monitor at 120hz. The current patcher breaks the functionality of the C9 and also does not give me 120hz on the Overlord through DisplayPort-to-DVI-D. It always worked in the past on my GTX 970 with DVI-D alone. To be honest, I don't understand what you mean by saying that the patcher does not affect DisplayPort limits. The signal is still having to go through the DVI-D cable, and this Overlord monitor is old enough that 120hz is an "overclock" mode, meaning that the pixel clock patcher along with CRU is the only way 120hz will even show up as an option. Something is wrong... Unless what you're telling me is that DisplayPort is incapable of running 1440 at 120hz without lowered color depth, which seems very unlikely to me. Is DisplayPort really less capable than DVI-D at 1440 120hz? I thought it was a newer technology with greater bandwidth.

In any case, keep in mind that the patcher is giving me blackscreen problems requiring a hardware restart of Windows on the Overlord monitor, not just on the C9 TV. There seems to be some kind of larger compatibility issue with these newest Nvidia drivers.

edit: Okay I just literally have no idea what you're talking about. DisplayPort definitely will do 1440p at 120hz: https://www.cablematters.com/blog/Displa...port-144hz

"You have to keep the pixel clock under 476 MHz, and that's with 6 bpc color. The limit for 8 bpc color is 357 MHz."

Are you talking about HDMI? What is this? I don't get it, man. If the pixel clock patcher isn't necessary to get DisplayPort to run at higher refresh rates, then why will 120hz not show up on under Advanced Display Settings even though I've added it in CRU? Every time I got new drivers in the past and was using DVI-D, I had to use the pixel clock patcher to get 120hz to show up as an option. How else am I going to convince Windows that this monitor can do 120hz?