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Vsync and FPS caps...

post #1 of 4
Thread Starter 
I know vsync caps your framerate at your monitor's refresh rate, but also does other things to remove screen tearing. However, there are side effects such as increased input lag, increased memory usage, and how it cuts your FPS cap to a divisor of the refresh rate if your frame rate takes a dip unless triple buffering is enabled.

However, say you're running a game at a constant 60 FPS and it never drops below that number. If you cap the frame rate at 60 FPS, would there still be tearing? From tests I've done in Source engine games and others, I still get screen tearing at a constant 60 FPS (monitor is 60Hz)... why is this? Is the myth that you should cap your FPS at your monitor's refresh rate in order to remove tearing complete bogus then?
post #2 of 4
I am curious about this. I tried turning frame sync off in black ops and got over 90 FPS but the screen looked really unstable or jittery. It was very annoying. I just play with it on now. I have seen some reviews from NCIX of him playing BC2 in eyefinity with vsync off and the screen looks stable. how is that possible? I guess I am getting horrible tearing.
post #3 of 4
As your said, Vsync will sync your screen with your GPU.

Therefore, if Vsync is enabled, you'll eliminate tearing. No frame will ever be refreshed before being fully displayed.

However, it is frequent that see games where Vsync isn't enabled properly. For example, the BC2 vsync option resets itself in the game. I get the same issue in Dirt 2, where I can't manage to put Vsync on. Use Radeon Pro to force D3D Vsync and triple-buffering. This is the only way to ensure it is on. The CCC settings are seldom working and TB is only for OpenGL.

Hope it helps.
Edited by GrandMax - 4/28/11 at 7:56pm
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GrandMax's
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CPUMotherboardGraphicsRAM
3570k 4.5GHz@1.250V Asus P8Z77-V PRO GTX 970 FTW G.SKILL CL7 Ripjaws 8GB 
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2 x 1TB (Samsung F3 + Caviar Black) + Crucial M... Samsung SH-S223C 22X DVD Writer SATA Win7 64bit Samsung LN46D630 120Hz 
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Logitech Wireless Corsair 850W Antec Nine Hundred Logitech M705 
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Razer 5.1 DTS (800W + Yamaha Receiver). 15'' Subwoofer. 
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post #4 of 4
Thread Starter 
I wasn't actually asking how to enable vsync, as I keep it off in almost all of my games.

I'm just wondering how it is possible for there to be screen tearing if you cap your FPS at your monitor's refresh rate (with vsync OFF)... wouldn't the framerate be synchronized with the monitor's refresh rate? Vsync does more than just limit your FPS.
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