Hello
Before anything - this is not the perfect solution but may be something that will help those people suffering from the Vsync Stutter Blues on lower end rigs.. Its has drawbacks and advantages.
The Theory (read if you actually want to know how vsync works)
Vsync works by telling the game engine to produce only so many frames. This is linked directly to what the Nvidia CP thinks the monitor's refresh rate is. All works well if the rig is capable of producing the required frames. If it isn't then vsync plays silly buggers and starts messing about with the frame display times. This causes what people see as stuttering or jerkiness.
So you have a 60Hz monitor - vsync will tell the game to produce 60 frames in a second to match the scan rate. each from will be displayed for precisely of 16ms. However if the game cannot produce the 60, even for the briefest of times, vsync will tell the engine to produce the next full scan timing down (in this case 30) - now that frame gets displayed for 32ms. This happens many times in second so if you use a fps counter you will never usually see a straight 30 fps but a figure somewhere between 30 and 60. In extreme cases the drop may be lower but you get the drift. The result is that frames are now be displayed in unequal measure and this disrupts the smoothness of the game.
This is especially annoying if you have a rig a capable for producing nearly all the frames nearly all the time.
The Workaround
In the control panel under the "Change Resolution" tab, change the refresh rate to 29hz (or whatever is nearest to half the actual refresh rate). The thing to remember is refrest rate timings - the rate youe set must be a rate that allows for a full scan cycle to be completed. Setting 50 or 45 or any random number wont work. So you can already see that the measure is something of a sledgehammer and not a scalpel.
In the game's video options do the same (selecting your preferred refresh rate at either 29 or 30hz - or whatever half the refresh rate is).
The game will need to restart but should now be making vsync lock the frame output to half of what it need before. This in turn gives you some headroom that may now prevent vsync from throwing a wobbler and displaying uneven frames.
The Drawbacks
Your mouse will be less responsive -so its really not a option you can leave for general desktop use. Its easy to change to and from though.
Head tracking will be a little less smooth - this is where your own preferences come in - a little less overall smoothness versus larger jitters when the scenes get heavy is a personal choice. Those using HAT quick views are likely to benefit most.
Fast action will not be as smooth but not by much - by fast action I mean watching a bomb drop in front of you or a plane past close in the opposite direction. in general the game isn't fast action due to the distances you are normally separated from other stuff by.
Finally - ive not spent much time testing - its here as a suggestion. Ultimately it may not work well for you but if you are considering this than you are already desperate so nothing ventured nothing gained.
Regards
BOO
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