Why doesn't 24hz work like 30hz

[Guest]

I remember trying this a long time ago in V3 and it didn't work then either. I have for a long time setup graphics setting profiles for different location based on getting slightly over 30fps with VSYNC off and unlimited frames. Perhaps about 35 at worst. I'd call the setting after the airport I was flying out of for example "KJFK Heavy" for a PMDG or "KJFK GA" for A2A or something less demanding. once I found the sweet spot I'd turn on Vsync and voila, buttery smooth 30fps locked by my 30hz display.

I have tried other strategy's to get the sim to run smoothly and I notices that the sim if you turn your setting high enough almost natively looks for 20fps and its quite smooth.

I figures that I could use the 24hz option in NVP and run the sim the same way as I do for 30hz and get a smooth result (I know that its a trade off) but 24hz is not smooth! Its a slide show despite being setup the same way as 30hz.

Comments, explanations or fixes please

[GSalden 4,657]

Did you set your monitors to 24 Hrtz too...

[Guest]

You don't need to do anything to your monitor or TV. NVP with only show frequency's reported by the display. In my case 24hz is available. But when selected and the sim is run at umlimited frames with Vsync on it is not smooth at all. And the frame counter shows a steady 24fps. I have seen the sim very smooth at 20 fps so long as you don't pan wildly. In theory it should be just as smooth at 24hz as it is with 30hz.

[Jiri Kocman 20]

Mz TV used for flying looks bad - stutters - when set to anything except 60Hz. I set 35FPS lock via NI and everything is perfect, even main thread CPU core load is lower.

[Dirk98 354]

On my side 24-25Hz works almost as good as 30Hz (P3Dv3.3-3.4). I can see a slight difference when panning around, but in heavy scenarios like flying to/from EGLL, EHAM I use 24-26Hz. Will try 20 yet, just curious.

Dirk.

[Michael Moe 495]

I tried 23-24-25 HZ on my TV (via Nvidia Control panel resolution screen) and VSYNC on - unlimited FPS,  and 25HZ is much smoother than the other two.

 

What is it that you do in "NVP" ? Which stands for ?

 

Michael Moe

[GSalden 4,657]

I have flown with 24 Hrtz monitors ( set in NV CP ) and Unlimited + VSync On + DXTory limiter at 24 in P3Dv3.

Now I have the same at 25 in P3Dv4.

[Guest]

All you  guys are getting the experience that I would have expected to get with 24hz. Hmmm, Strange that it is not working for me, since I am the one who invented the 30hz at unlimited with Vsync on in the first place. LOL, Just kidding it wasn't me it was Rob.

[GHarrall 494]

I assume It's because its not 1/2 (30) or 1/3 (20) 

if you try putting the monitor to 20Hz and frames at unlimited I'm guessing it will work. 24 into 60 doesn't go. 

[Guest]

nope that's not how it works. Your thinking half refresh rate. This is more like exactly the refresh rate you set NVP

[GHarrall 494]

When you turn vsync on, any frame dip below 60 drops to 30. Any frame dip below 30 drops to 20. That's how vsync works and why it induces microstutter if you can't maintain it. 

Setting a custom refresh at 30 or 20 makes sense. Using odd numbers like 24 or 25 doesn't.

im not thinking about 1/2 or 1/3refresh in nvi at all, although there are obvious reasons why it's set up that way. 

 

[gboz 157]

1 hour ago, GHarrall said:

Using odd numbers like 24 or 25 doesn't.

 

24 will step down to 12 like 144 will step down to 72. Nothing sacred about 60.

gb.

[GSalden 4,657]

3 hours ago, gboz said:

24 will step down to 12 like 144 will step down to 72. Nothing sacred about 60.

gb.

Exactly, when using 24 or 25 there will be no step down if the settings are configured correctly.

Using 60 with downstepping to 30 or 20 and backup causes jitters or stutters..