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Help Understanding Vsync

Last response: in Graphics & Displays
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December 20, 2012 12:09:40 AM

Hey everyone. I just built my first system about a month ago and I need some help understanding Vsync and its quirks. I've been trying to run Crysis on full settings with vsync on and it only gives me 24 fps, according to Fraps. Without Vsync, im running between 80 and 100 fps. Without Vsync, I get terrible screen tearing. With it, I don't, but 24 is pretty low, especially with what I'm using. Shouldn't it just run at 60 fps with Vsync? I'm really confused. I've posted my system below. Thanks everyone.

Intel Core i7 3770K
Corsair Vengeance 16 gb
Sapphire AMD Radeon HD 7950
GIGABYTE GA-Z77X-UP4 TH
Corsair AX850 Gold PSU
Samsung Syncmaster S23B550

More about : understanding vsync

December 20, 2012 12:34:09 AM

vsync only works in full screen mode and it attempts to synchronize the framerate of the game with the framerate of the monitor.

The reason why you don't get 60fps is that it is very taxing on the system.
Try lowering the native refresh of the monitor in windows if you can. Like on mine I can go from 60 to 58.
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December 20, 2012 12:43:43 AM

memadmax said:
vsync only works in full screen mode and it attempts to synchronize the framerate of the game with the framerate of the monitor.

The reason why you don't get 60fps is that it is very taxing on the system.
Try lowering the native refresh of the monitor in windows if you can. Like on mine I can go from 60 to 58.


So I can get 60 fps while not in full screen. Do you need to have a ridiculous monitor to run things in full screen?
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December 20, 2012 1:36:54 AM

memadmax said:
vsync only works in full screen mode and it attempts to synchronize the framerate of the game with the framerate of the monitor.

The reason why you don't get 60fps is that it is very taxing on the system.
Try lowering the native refresh of the monitor in windows if you can. Like on mine I can go from 60 to 58.


Just curious, what would lowering the refresh rate do for my fps?
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December 20, 2012 3:11:35 AM

grungeallday91 said:
Just curious, what would lowering the refresh rate do for my fps?


nothing... all refresh rate dictates is the max fps that can be shown...

so if you have it at 50 hz, the max fps is 50 fps. 60 hz is 60 fps...
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December 20, 2012 5:44:33 AM

Sorry killer, u got them confused too.
Lowering refresh rate would lower workload on computer and could therefore raise FPS.
This only applies with VSYNC enabled however.
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December 20, 2012 6:47:20 AM

memadmax said:
Sorry killer, u got them confused too.
Lowering refresh rate would lower workload on computer and could therefore raise FPS.
This only applies with VSYNC enabled however.

raising the fps wouldn't matter if it lowers the max frame rate the display shows... and lowering the refresh rate also doesn't raise the fps that much...

He's taking a hit in performance because of fraps as well...
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December 20, 2012 6:58:48 AM

memadmax said:
Sorry killer, u got them confused too.
Lowering refresh rate would lower workload on computer and could therefore raise FPS.
This only applies with VSYNC enabled however.



If you have V-sync on the FPS is tied to the refresh rate, lowering the refresh rate can only result in lowering the FPS.

I assume the idea behind the suggestion was to try and tweak the balance to try and get the FPS and refresh back into balance. Much better to try something like increasing quality settings or enabling triple buffering on the GPU to try and slow it down a little.

Mactronix :) 
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December 20, 2012 7:00:51 AM

enable triple buffering. Get radeon pro to force it on. That should help.
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