Putting PC on 120hz Settings with Nvidia Control Panel

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Oct 16, 2010
I just recently got a new Samsung UN40C6400RFXZA. The TV apparently has a 120hz capability and I want to take advantage of that feature.

On the other hand. I just upgraded my PC with Nvidia GTS 450. I want the display settings to have 120hz on the monitor. However, when I tried to use the custom resolution to make it into 1920x1280 with 120hz, the test fails and I'm stuck with 60hz.

I'm currenly using an a single mini-HDMI to HDMI 1.4 I just recently bought.

If anyone knows about both the HDTV or the PC settings can anyone help me out?

HDTVs do not accept 120Hz input; only 60Hz.

120Hz and 240Hz for HDTVs refers to video processing that is done internally by HDTVs to make video playback smooth and also "improve" the video quality so things look a little more life like. Some people say it makes movies look artificial.

Even 3D HDTVs are not truly 120Hz. Video input is still limited to 60Hz and when using it to play 3D games 3D movie the output is reduced to 48Hz; 24Hz per eye.

It confuses a lot of people.

The Auto Motion Plus 120Hz Refresh Rate does not mean that the TV accepts a video input signal with a 120 Hz vertical refresh rate. The TV accepts only video input signals with a 60 Hz vertical refresh rate.

The Auto Motion Plus 120Hz Refresh Rate is used to eliminate motion blur. It is image post-processing done by the TV's own circuitry and is done by calculating an interpolated image and inserting it, creating a non-repetitive transition from one frame to the next.


Jun 24, 2010
Sorry I didn't bother looking up your TV model, you don't actually have any HDMI 1.4 ports, the 120hz is just interpolated frames on HDTV signals, you're stuck at 60 hz.

If you actually had a 3d TV with HDMI 1.4 you could do 720p at 120hz, it's only 1080p that is limited to 48hz (24 per eye)

QFT. My UN40C7000 is the same way; it doesn't accept 120Hz input.

3d is a fad, especially with all the different standards.
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