30 Hz on a 60/75 Hz Monitor

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AJ_O

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I am going to be building a new desktop this holiday season, and I already have my monitor.
The monitor is an AOC917Wx, and it says it's capable of 56, 59, 60, and 75 Hz. I want to lock the refresh rate to 30 Hz through Windows, or through something else, so with Adaptive V-Sync, on the GTX 750 Ti I was planning on getting, I would have a better gaming experience. The problem is, I want to know if it is safe to force a lower refresh rate. I can't seem to find anything online about this particular model, but I guess I want to know in general.

Any help would be appreciated.
 
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You have two good options, even though you may decide you don't like it.

1) With that Nvidia card, Adaptive-Vsync (half refresh) will result in 30 FPS constantly on a 60hz monitor.

2) You can go into the nvidia control panel and create a custom resolution, which allows you to also pick a refresh rate. I have a 120hz 1080p monitor, but I have a couple custom resolutions as well. One for 85hz, another for 2560x1440p (behaves like OGSSAA), and I just tested 30hz, which I have now. My mouse movements are far more choppy at the moment.
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AJ_O

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Could you explain what you mean by flicker? Do you mean frames will not arrive on time and there will be obvious pauses?
 
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hunter315

hunter315

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Instead of frames arriving every 16.6 ms they will arrive every 33.3 ms which is a long enough gap for many things in frame to have changed so things will seem much more jumpy. Movies only get away with the lower frame rate due to motion blur so you have one smeared image being processed with the next smeared image a while later, most things on a PC don't have motion blur so you have one crisp frame then another slightly offset crisp frame, but by reducing the frequency you will have a bigger gap so things will have moved father making it harder for your brain to interpolate the motion.
 
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AJ_O

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I was only planning to lower the refresh rate when I was about to play a demanding game. The 750 Ti isn't all that powerful a card, and I wanted to lock it at 30 FPS, because a stable, non-fluctuating 30 FPS is better than an all over the place 45 to 50 to 30 and back. Unless I misunderstood what Adaptive V-Sync is, and it works differently than I thought, I assumed that it would use the monitor's refresh rate, and lock FPS to that. I know G-Sync(in certain monitors) changes the monitor AND the card's FPS to match, but I wasn't 100% sure on Adaptive.
 
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manofchalk

manofchalk

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Your fine.
Your GPU will output 30FPS, and your monitor will simply display those 30 frames over 60 frames. All the monitor is doing is receiving frames from the GPU and putting them out to the panel as quick as possible, its refresh rate has no relation to the input signal FPS (Except for G/FreeSync).

Adaptive V-Sync to my knowledge is Nvidia's way of on-the-fly way of changing the VSync FPS cap. Most Vsync option limit it to 60 as thats what most monitors run at, but if performance is low enough it does nothing and you still get janky gameplay. The answer is then to drop it lower to smooth it, but then if you perform better than that limit your losing performance. Adaptive Vsync is just Nvidias solution to dynamically adjust the FPS cap so it doesnt incur either of these problems in games where the FPS can shift wildly.
 
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bystander

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You have two good options, even though you may decide you don't like it.

1) With that Nvidia card, Adaptive-Vsync (half refresh) will result in 30 FPS constantly on a 60hz monitor.

2) You can go into the nvidia control panel and create a custom resolution, which allows you to also pick a refresh rate. I have a 120hz 1080p monitor, but I have a couple custom resolutions as well. One for 85hz, another for 2560x1440p (behaves like OGSSAA), and I just tested 30hz, which I have now. My mouse movements are far more choppy at the moment.
 
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AJ_O

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See, what I am confused about is the fact that while my GPU is running a game at 30 FPS, it still looks laggy ass all heck compared to a console. I know that if you try to display 30 FPS on a 60 Hz monitor, it will still lag behind a bit because there are less frames than the amount of time it refreshes on the screen.
 
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AJ_O

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Thank you very much for that information. I guess I'll avoid the 30 Hz like I was planning on. I'll just have to stick to Adaptive V-Sync when I play. Thanks for explaining all that!
 
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bystander

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Adaptive V-sync does not do that. Though there is one option to drop the cap in half using the Adaptive V-sync (half refresh rate) option.

What it normally does is use V-sync if you reach your refresh rate (or half if you use that other option mentioned), or turn it off if you fail to.
 
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AJ_O

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Actually, since I have you here, where would the 'half' refresh rate option be? Is it in the same drop-down category as normal Adaptive?
 
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