Monitors

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Optimizing Monitors for Sim Racing

LED vs OLED Refresh Rate vs Pixel Response Time

  • We've All Been Duped by LED LCD's Input Lag vs OLED for Gaming [Video] HDTVTest (2021) - At 0m36s there is a good demonstration of why even when there's negligible refresh rate and input delay differences, the OLED picture and motion is still significantly clearer and quicker to complete each frame
  • LEDs get down to 1ms pixel response time whereas OLEDs get down to 0.1ms, a 10x improvement which results in less "smear" as objects in the image move
  • It is very possible for lower pixel response times to provide a better visual experience than higher pixel response time even at much higher refresh rates
    • For example, 0.1ms @60hz OLED could be a better visual experience than 1ms @120hz LED

Example pixel response times from Rtings.com [1] [2]:

  • OLED response times are much lower and have more consistency in times
  • LED pixel response times can be wildly greater than advertised (Up to 40x advertised times: 40ms vs 1ms) while OLED maintains a narrower margin of variability (~10x or 0.1ms vs 1.1ms deviance)
    • Although this might have to do with the quality of the product: LG C4 is a top end product while the MSI Optix is on the lower end of 'gaming' monitors
  • LG C4 OLED @60hz

    LG C4 OLED @60hz

  • LG C4 OLED @144hz (Max)

    LG C4 OLED @144hz (Max)

  • MSI Optix G27CQ4 @60hz

    MSI Optix G27CQ4 @60hz

  • MSI Optix G27CQ4 @165hz (Max)

    MSI Optix G27CQ4 @165hz (Max)


LED vs OLED Ghosting Example [3]:

Quality OLED can produce clean, artifact-free, ghosting-free frames, every time

Framerate Limiting

  • Options:
    • MSI Afterburner's RivaTuner Statistics Server (RTSS)
      • MSI Afterburner works with any make/model of video card
      • Bonus: This options allows you to instantly update the framerate limit while the game is running by alt-tabbing to the RTSS window
    • NVIDIA Control Panel
    • NVIDIA Inspector's Profile Inspector mode
      • Mostly just as an alternative to RTSS/NVCP for older D3D9 games in my experience

LG C4 OLED Evo 2024

Mini Review for LG C4 OLED Evo 2024

  • 42 Inch LG OLED evo AI C4 4K Smart TV 2024
  • The Best Monitor is a TV - LG C4 42" OLED Review (2025) [Video] - See description for Optimized TV settings
  • Model: OLED42C4PUA
  • Early thoughts:
    • Upgraded from my 1440p 32" LED 165hz to a 4K 42" LG C4 42" OLED
    • 120hz, 144hz overdrive but I probably won't push it to get that
    • 4K is nice but actually not as big a deal coming from 1440p, maybe it would be from 1080p, though. I'd say stick with 1440p and save your fps if you're 32" or lower but also maybe I wouldn't like 1440p on 42", I don't know.
    • The big win is oled response times (0.1ms) vs led 1ms. They both have margins up to 10x in worst case scenarios but because oled is so much lower to begin with it's still a noticeable improvement.
    • So, even though I have less refresh rate, the pixel response times more than make up for it.
    • You'll hear about text fringing making text unclear but now that I see it, with 125% scaling, it doesn't both me
  • I don't worry about burn-in as much as I thought I would:
    • The LG C4 really reduces the worry about burn-in with features you don't have to worry about remembering to do, like pixel shifting, automatic dimming, and a screensaver when there's no activity, and there is a manual pixel refresh procedure accessible from the menus
    • Pixel shifting, automatic dimming, and the screensaver really go a long way to helping reduce burn-in anxiety

You must have a quality HDMI cable that meets spec

Visual Glitching After PC Reboot

  • Sometimes, after a length session of completely stable image display, I'll reboot and visual glitching will start to happen eg. white line flashing, black full screen flickering
  • It feels to me like it's something to do with HDMI, cable seating, EMI interference, or something
  • Re-seating the cable at the TV seems to help
  • Update: Now seems reliable after reboots. Key seems to be quality, certified HDMI cable and not using the Game Optimizer

Game Optimizer Instability on PC

  • It seems the screen will start glitching when Game Optimizer is used on PC (HDMI) eg. horizontal white line flashing, frequent black screen flashing (whole screen goes black)
  • Problem is 120hz doesn't seem to be available on Windows until you enable Game Optimizer mode
  • But once you do set Windows to 120hz, it seems you can disable Game Optimizer and keep 120hz even across reboots

HDMI Deep Color Prevents PC Screen Displaying on LG C4 OLED TV

  • tl;dr Turn off HDMI Deep Color from Settings > General > External Devices > HDMI Settings > HDMI Deep Color (On an LG C4 OLED)
    • Update 2025-05-31: I don't know what changed but HDMI Deep Color now seems to work. The only thing I can think of is that I have Game Optimizer disabled now. You may have to enable Game Optimizer and go through the TV menus to get the PC display back. After that, it should be fine.
    • Alternate: Reset to factory defaults
  • Enabling Game Optimizer on an LG C4 OLED on a PC did not allow the PC to display anything
  • I had to disable HDMI Deep Color to get it to display the image again

Troubleshooting

Intermittent Visual Gridding Artifacting

  • My Solution: Disable FreeSync in the monitor settings
    • I wasn't gaining much anyway since I'm able to maintain a stable 90fps in the game I was playing (GTR2)
    • And Windows Triple Buffers windows (I was using GTR2 in borderless window mode) which avoids screen tearing
  • My description in Simwiki Discord:
    • You guys ever get this weird 'gridding' visual effect on the monitor screen that comes and goes?
    • It's almost like old school crt overscan but sometimes it looks to me like it's diagonal lines.
    • Sometimes the image is absolutely clean and then this shows up. It's very subtle.
    • Almost like what I imagine a screendoor effect is like (never tried vr to see what it really looks like).
    • It's super fine, like pixel level. Almost looks like a filter overlaid on top of the image.
    • It seems to be at the monitor level because it comes and goes.
    • My monitor is 1440p, freesync, 165hz. I've got GTR2 limited to 90fps. I have it on fastest pixel response time and racing gaming mode. Not sure if any of those variables cause it.
    • Maybe my monitor is just dying?
      • It wasn't. It was FreeSync.

HDMI Cables Don't Matter - Until They Do

  • Buy quality but don't buy expensive ie. expect to pay $20-$40 CAD
  • All quality HDMI cables support 1080p60, the problems happen when you want higher resolution and refresh rate
  • Look for HDMI cables that have decent customer ratings ie. on Amazon
  • Look for HDMI cables that specifically say they support the resolution and refresh rate that you want to run
  • Look for HDMI cables with the bandwidth rating required to run your resolution and refresh rate
  • Research HDMI cables on YouTube to get a handle before buying
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