The effect is while no gains in FPS it maximizes the chances that every frame drawn will make it from the video card to the monitor whenever your FPS is beneath vsync's wanted rate, the result is visually smoother or more consistent play in harder to render scenes.
Or you can just turn off vsync to accomplish the same end-goal.but Gamebryo games traditionally have odd behavior without it and there is the usual chances of screen-tear so your milage may vary. Currently trying to use d3d Overrider and ReShade causes the game to not start. Without triple buffering but with vsync and the game play is running at less then vsync's want then you get into a situation where your video card can spend a lot of time trying to draw frames meant to be sent but are being dropped because it can't quite finish each one in time (based on the schedule defined by vsync), that's a lot of wasted effort. Support would be nice because it would allow me to enjoy increased visual fidelity along with no Screen tearing and good v sync. Though I completely understand if you cant do thisdont want to do this.
Since its probably a really small amount of people that even use d3d Overrider. The downside to triple buffering: your video card has to keep that third frame in memory instead of just the one its drawing and the one its ready to present so it eats a little more vram that's all, from my completely unresearched asumption it'd be roughly (your screen size * 4(32bit=4bytes)) bytes more then without (or ~8MB for a standard 1080P display).
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