True 120Hz from PC to TV

Updated 2019 Edition

Presenting updated instructions for 120 Hz refresh rate on existing 1080p or 4K televisions or DLP projector, on this page’s sixth anniversary, 2013-2019!

Unlock True 120 Hz Refresh Rate On Your Television!

Purpose: Use TV as a 120Hz computer monitor. Smoother motion and less input lag.
Supported Displays: Many HDTVs have hidden true 120Hz support. This includes Active 3D HDTV’s (the type that use electronic shutter glasses), as well as 4K Ultra HD televisions.
Alternatives: See List of 120Hz, 144Hz and 240Hz Monitors for computer monitors instead.

Many Televisions Unofficially Support True 120 Hz From A PC

Many TV’s do 120Hz internally for a different purpose (e.g. motion interpolation, active 3D). These TV’s support the dot clocks necessary for a true 120Hz refresh rate. Historically, this was called “refresh rate overclocking”. However, most newer HDTVs already support true native 120 Hz as an unadvertised feature.

Benefits of 120 Hz Instead of 60 Hz

  • 120 Hz has 50% less motion blur than 60 Hz, for text scrolling, panning, and video games.
  • 120 Hz feels faster and has less input lag than 60 Hz in your computer games
  • 120 Hz allows you to natively play HFR 120fps video on your computer.

EASY Instructions: When Your Television Has Automatic 120 Hz Support

  1. Try the easy instructions at Oh No, I’m At The Wrong Refresh Rate.
  2. If 120 Hz does not show up, try testing a lower resolution and see if 120 Hz shows up.
    Try 1920×1080 on a 4K HDTV.
    Try 1280×720 on a 1080p HDTV.
    Try 1280×800 on a DLP projector.
  3. If 120 Hz shows up and it works, you’re done!
    Now test your new 120Hz at

ADVANCED Instructions: Manually Force 120 Hz Output From PC To TV

If the EASY instructions above fails, you will have to instead force 120 Hz into your HDTV since the HDTV is not advertising its ability to support 120 Hz. Try one of the following Custom Refresh Rate methods:

  • Use NVIDIA Control Panel or AMD Catalyst Control Center if you have an AMD or NVIDIA GPU.
    Right-click an empty area of your Windows desktop and launch. Then follow these steps:

    If using the full resolution fails,
    Try testing 1920×1080 on a 4K HDTV.
    Try testing 1280×720 on a 1080p HDTV.
    Try testing 1280×800 on a DLP projector.
  • Or Install ToastyX Custom Resolution Utility
    This is a method that works on both GeForce and Radeon.
    (For GeForce, NVIDIA’s Custom Resolution feature can also be used).

    If using the full resolution fails,
    Try testing 1920×1080 on a 4K HDTV.
    Try testing 1280×720 on a 1080p HDTV.
    Try testing 1280×800 on a DLP projector.
  • Or Expert Hacker Method:
    Install a Manual EDID override. This is the hardest method, recommended only for advanced users. If you need to get familiar with how EDID overrides are installed, see 3D Vision Blog Instructions (different purpose), and Microsoft technical info.

DISCLAIMER: Follow these instructions at own risk. Blur Busters disclaims all responsibility for any possible damage or disruptions. Historically, nobody has ever reported television damage from doing this. However, please follow the Tips below for software recovery instructions if you accidentally misconfigure your computer.

Important Tips

  1. Try the EASY Instructions First.
    Do the ADVANCED Instructions only if the EASY instructions don’t work.
  2. If Using Multiple Displays, Make Your HDTV the Primary Monitor for Reliable 120 Hz
    If you are connecting multiple screens to a computer or laptop.


  3. If Using Multiple Displays, Choose “Extend Desktop To This Display”
    When using multi-monitor, 120 Hz is easier when not duplicating or mirroring.


  4. If Full Resolution Fails, Try Testing 120 Hz At Lower Resolutions
    Try testing 1920×1080 on a 4K HDTV.
    Try testing 1280×720 on a 1080p HDTV.
    Try testing 1280×800 on a DLP projector.
  5. Test Other GPU Outputs
    Only some of the GPU outputs may support 120 Hz.
  6. Test Other Television Inputs
    Only some of the television inputs may support 120 Hz.
  7. Test Other Cables or Adaptors
    If you have a very old HDMI cable (over 10 years old), try a newer HDMI cable.
    If you have a single-link DVI cable or DVI-to-HDMI adaptor, you can only do 120 Hz at 1280×720.
    You need dual-link DVI cable in order to do 120 Hz at 1920×1080 over DVI.
  8. ADVANCED: Test ToastyX Reduced Blanking Interval in a Custom Resolution Utility
    Some older televisions only “almost” reaches 120Hz, but not quite.  For example, 115 Hz or 118 Hz.  To fix such a minor shortfall, reduce the timings (smaller numbers for Front Porch, Back Porch and Sync) to maintain same dotclock while raising refresh rate. Using “Reduced” instead of “Automatic” within ToastyX Custom Resolution Utility, can do this too. This may allow success at 120Hz
  9. ADVANCED: Uninstalling ToastyX CRU To Fix Everything
    If you have problems with ToastyX Custom Resolution Utility, just run “reset-all.exe” to undo the changes made by the ToastyX Custom Resolution Utility.
  10. ADVANCED: Fix In Safe Boot Mode
    Your screen may go blank, black, and/or display distorted graphics until you reset back to 60 Hz. Normally, the refresh rate test should automatically switch back to 60 Hz if you are unable to successfully confirm 120 Hz. In the event you accidentally get stuck in an unviewable resolution or refresh rate, you can reboot into Safe Mode via pressing F8 while turning on your computer. From there, you can switch back to 60 Hz via Control Panel.

Verify That Your Television Is Correctly Display 120 Hz

  1. View The Motion Test at
    The 120 fps UFO should have approximately half the motion blur of the 60 fps UFO.
  2. Do A Frame Skipping Test
    If the 120fps and 60fps UFOs look identical, run the TestUFO: Frame Skipping Check.
    If your television is skipping refresh cycles, try a lower resolution such as 720p instead of 1080p.

No fake frames. No interpolation tricks. No Motionflow voodoo. True 120Hz!

If you have a success report in doing 120 Hz HDTV refresh rate, please feel free to post your TV model in the Blur Busters Forums!

142 Comments For “True 120Hz from PC to TV”

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Hey, do you know if it’s possible for the Samsung UN32H6350 to do true 120hz?

I’ve confirmed that it does have a native 120hz screen, but I’ve also heard rumors that Samsung locks their TV’s at 60hz. I’m really hoping it will do 120hz but I can’t find much information…


I have the Samsung UN50H6350 myself, connecting to GeF and am experiencing about the same results as you only the 77hz setting actually gives me a much more blurry image than 60hz @ 1920×1080


Sorry for previous accidental post.. I have the Samsung UN50H6350 myself, connecting to a GeForce GTX 770 and it seems I am experiencing about the same results as you except the 77hz setting actually gives me a much more blurry image than 60hz @ 1920×1080.. I was under the impression this is a 1080P 120hz native display, 120hz for PC gaming refresh rate was a big selling point for me. Now I am hearing that Samsung prevents ANY HDMI input devices from actually producing 120hz.. What?!? There are ONLY HDMI ports on this TV, 4 of them, nothing else. One of them is labeled as ‘HDMI4/DVI’ but I can’t find any useful info on how this ‘DVI’ port is unique in the way it handles input.. I’m now wondering if turning on the ‘Game Mode’ feature to reduce lag is even useful since I have the ‘Auto Motion Plus’ feature disabled and now running at a true 60hz all around as far as i can tell. Also enabling ‘Game Mode’ on this TV seems to lock out a few of the advanced picture options/settings.. It’s a shame I’m having these issues, it’s a pretty good looking TV with good values set on the advanced picture settings enabled, I was just hoping for higher frame rates :-/ Any thoughts? Anyone know about an advanced overclocking guide to finely tune one of these TV’s? I’m determined to know for sure if anything can be done about this before I go through the trouble of replacing this thing.


Did you have any luck with Samsung HDTV?
I have ue48h6400 3d, and no way to overclock it . Is it a true with hdmi 60hz samsung lock? Any way to unlock it?
Best regards


I am having this same issue. It does support 77hz though. That is the highest I’ve been able to display mine. I have the 40 inch model that also has 240hz clear motion. I’m not sure why it says it supports 120hz native refresh rate if it can’t obtain that. My only guess is that it doubles every frame. It does look a ton better at 77hz though. But I will be returning it and just going with a 144hz monitor.


I recently bought a 4K LG 49UB850T (equivalent to the UB8500 in the US) partly to use it as computer monitor, and I had a questions:
First: Isn’t a 4K TV supposed to be able to run 1080p at 120 Hz easily, as it is supposed to be able to run 4K at 60Hz with HDMI 2.0?
If not, can I use “ToastyX Custom Resolution Utility” to force a 1080p @120 Hz on my TV?


Did you ever get this to work, I am considering buying a Samsung 4K capable of HDMI 2.0 and 3D and want to know if this will work.


Ok I followed these directions exactly and after having trouble with the Toasty Utility and running the reset all program. My computer will no longer extend the desktop onto a second monitor. It recognizes both monitors and will run them both individually or as a mirror but it will not allow me to use them as two separate monitors either through the windows control panel or Nvidia control panel. Whenever I try to run them both it shuts one off. I’m at a total loss, please help


Been trying all day to get my Panasonic txp50vt65 to play ball, just keep getting a black screen though. Seems crazy that it can do 120hz for the 3d but can’t do it for an incoming signal. I can even get it to put my game into 3d?!?!


I have the optima HD131Xe 3D projector which plays at 120Hz in 3D mode but whenever I connect up my macbook pro via screen mirroring, it only does 60Hz, this maybe due to my graphics card in my early 2010 macbook pro or possibly a configuration issue, id like to be able to set the projector to refresh at 120Hz as I watch lots of movies via this method. Though theres no option in the settings