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Question on VSYNC

post #1 of 8
Thread Starter 
Is it better to turn off vsync rather than enable adaptive vsync if fps is lower than refresh rate (120Hz)?
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post #2 of 8
FPS fluctuates a lot and may go over 120fps in certain scenes. I'd just keep adaptive on considering there's no performance hit. You have nothing to lose by keeping it on.
post #3 of 8
Thread Starter 
Quote:
Originally Posted by Inglewood78 View Post

FPS fluctuates a lot and may go over 120fps in certain scenes. I'd just keep adaptive on considering there's no performance hit. You have nothing to lose by keeping it on.

I understand but let's just say theoretically a game on my system ALWAYS produce fps below the refresh rate, is there a difference in using AVS and VSYNC OFF? Some say that even with AVS, as long as the fps is below the refresh rate, you will still notice tearing. I'm not sure if this is also true when vsync is disabled?
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post #4 of 8
Quote:
Originally Posted by kevindd992002 View Post

I understand but let's just say theoretically a game on my system ALWAYS produce fps below the refresh rate, is there a difference in using AVS and VSYNC OFF? Some say that even with AVS, as long as the fps is below the refresh rate, you will still notice tearing. I'm not sure if this is also true when vsync is disabled?

In your scenario, yes, its pointless to have AVS on and if there is a cost, its best to turn it off.
post #5 of 8
Thread Starter 
Quote:
Originally Posted by Inglewood78 View Post

In your scenario, yes, its pointless to have AVS on and if there is a cost, its best to turn it off.

Well, that's what I was asking, is there a cost to it in my situation?

Also, where is AVS (half refresh rate) really effective for?
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post #6 of 8
Quote:
Originally Posted by kevindd992002 View Post

Well, that's what I was asking, is there a cost to it in my situation?

Also, where is AVS (half refresh rate) really effective for?

There is no cost to adaptive, or its so small it cant be detected.

Can't think of a situation where half refresh is needed...
post #7 of 8
-- Adaptive VSYNC looks visually exactly like VSYNC ON whenever framerate matches refresh rate.
-- Adaptive VSYNC looks visually exactly like VSYNC OFF whenever framerate falls below refresh rate.

Adaptive VSYNC is simply a special mode of VSYNC OFF where the graphics drivers intelligently steers the tearing to be off the edge of the screen (via timing the frames), on a best-effort basis. So no extra frame buffers are used for Adaptive VSYNC than for VSYNC OFF. Adaptive VSYNC is kind of like an input-lag-reduced VSYNC ON, which is a great compromise for people who want the perfect motion fluidity of framerate=Hz of VSYNC ON but hate the input lag issues of VSYNC ON.

If you're always running framerates below refresh rates, Adaptive VSYNC will always look like VSYNC OFF, and there's really no difference in tearing. The pros/cons for your eyes basically occurs whenever you're sometimes at framerate=Hz and sometimes framerate lower than Hz.

With VSYNC ON:
...framerates that occasionally dip lower than Hz, will cause a sudden division of framerates (e.g. 120fps -> 60fps -> 40fps -> 30fps) accompanied by sudden annoying increases/fluctuations in input lag. Some people who really hate tearing, still prefer this setting.

With Adaptive VSYNC:
...framerates that occasionally dip lower than Hz, will cause tearing to suddenly appear, it just behaves exactly like VSYNC OFF. You won't get the sudden dramatic changes of input lag that occurs with framerate fluctuations with VSYNC ON.

That said, if your framerate is always below refresh rate, it doesn't matter if it's VSYNC OFF or Adaptive VSYNC since both behave exactly the same in that case (motion, tearing, lag). Adaptive is useful if you're often framerate=Hz (but not sustaining it at all times).
Edited by mdrejhon - 8/9/13 at 4:07pm
post #8 of 8
Thread Starter 
Quote:
Originally Posted by mdrejhon View Post

-- Adaptive VSYNC looks visually exactly like VSYNC ON whenever framerate matches refresh rate.
-- Adaptive VSYNC looks visually exactly like VSYNC OFF whenever framerate falls below refresh rate.

Adaptive VSYNC is simply a special mode of VSYNC OFF where the graphics drivers intelligently steers the tearing to be off the edge of the screen (via timing the frames), on a best-effort basis. So no extra frame buffers are used for Adaptive VSYNC than for VSYNC OFF. Adaptive VSYNC is kind of like an input-lag-reduced VSYNC ON, which is a great compromise for people who want the perfect motion fluidity of framerate=Hz of VSYNC ON but hate the input lag issues of VSYNC ON.

If you're always running framerates below refresh rates, Adaptive VSYNC will always look like VSYNC OFF, and there's really no difference in tearing. The pros/cons for your eyes basically occurs whenever you're sometimes at framerate=Hz and sometimes framerate lower than Hz.

With VSYNC ON:
...framerates that occasionally dip lower than Hz, will cause a sudden division of framerates (e.g. 120fps -> 60fps -> 40fps -> 30fps) accompanied by sudden annoying increases/fluctuations in input lag. Some people who really hate tearing, still prefer this setting.

With Adaptive VSYNC:
...framerates that occasionally dip lower than Hz, will cause tearing to suddenly appear, it just behaves exactly like VSYNC OFF. You won't get the sudden dramatic changes of input lag that occurs with framerate fluctuations with VSYNC ON.

That said, if your framerate is always below refresh rate, it doesn't matter if it's VSYNC OFF or Adaptive VSYNC since both behave exactly the same in that case (motion, tearing, lag). Adaptive is useful if you're often framerate=Hz (but not sustaining it at all times).

Got it, completely. Now my last concern about vsync would be AVS (half refresh rate), why do you even need that?
My System
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CPUMotherboardGraphicsRAM
Intel Core i7-2600K Asus P8Z68-V/GEN3 EVGA GTX 1080 Ti FTW3 2x8GB G.Skill Trident X (F3-2400C10D-16GTX) @ 2... 
Hard DriveHard DriveCoolingOS
Samsung 850 EVO 500GB Samsung Spinpoint F3 1TB CPU: Swiftech H220-X Windows 10 x64 Enterprise 
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Dell S2716DG Ducky Shine 3 DK9008 MX Brown and Red LED Seasonic P-760 SS-760XP2 Cooler Master HAF 922 
MouseMouse PadAudioAudio
Roccat Savu Steelseries QCK Mass Edifier HCS2330 2.1 Speaker System (using Onboa... HyperX Cloud Revolver Gaming Headset 
Other
APC BR1500GI UPS 
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My System
(18 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i7-2600K Asus P8Z68-V/GEN3 EVGA GTX 1080 Ti FTW3 2x8GB G.Skill Trident X (F3-2400C10D-16GTX) @ 2... 
Hard DriveHard DriveCoolingOS
Samsung 850 EVO 500GB Samsung Spinpoint F3 1TB CPU: Swiftech H220-X Windows 10 x64 Enterprise 
MonitorKeyboardPowerCase
Dell S2716DG Ducky Shine 3 DK9008 MX Brown and Red LED Seasonic P-760 SS-760XP2 Cooler Master HAF 922 
MouseMouse PadAudioAudio
Roccat Savu Steelseries QCK Mass Edifier HCS2330 2.1 Speaker System (using Onboa... HyperX Cloud Revolver Gaming Headset 
Other
APC BR1500GI UPS 
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