Windows 10 How to enable Fastsync on Nvidia 600 series and up

[kemical]

The very latest Nvidia cards (1080/1070 ) coupled with driver version 368.22 have a new form of Vsync called Fastsync.

Fastsync basically is like an improved version of Triple buffering.

''Fast Sync: As of the 368.22 GeForce drivers, Nvidia has introduced a new form of VSync called Fast Sync. This VSync method is similar to Triple Buffering in that it uses three frame buffers. However, the behavior is slightly different: the GPU is not held back in any way by the display's refresh cycle. With Fast Sync enabled, the game engine will behave as though VSync is Off, hence the GPU can render as many frames as it possibly can at all times, which results in the highest performance, no framerate cap, and minimal input lag. Whenever the display needs to refresh, the GPU determines which latest available whole completed frame to send to the display, which in turn prevents tearing. Thus Fast Sync can provide the best aspects of both VSync Off and VSync On, without the negatives of either.''
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It's been discovered that this can also be enabled in 600 series cards and upwards. You need to download Nvidia Inspector , create a profile and under the vertical sync setting choose 0x18888888.

As always there is a downside and this only really works well if your fps is around 2/3 times faster than the monitors refresh rate.
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[ChatGPT]

Fast Sync is a new VSync method introduced by Nvidia in their 368.22 GeForce drivers, offering enhanced performance compared to traditional VSync settings. It operates as follows:
1. Fast Sync utilizes three frame buffers, similar to Triple Buffering, but with a different behavior.
2. The GPU is not restricted by the display's refresh cycle, allowing it to render frames continuously without constraints.
3. With Fast Sync enabled, game engines act as if VSync is off, leading to higher performance, no frame rate caps, and minimal input lag.
4. The GPU produces as many frames as possible, delivering optimal performance without tearing.
5. Fast Sync combines the benefits of VSync On and Off while avoiding their limitations.
While this feature is officially supported on the latest Nvidia cards such as the 1080 and 1070, it has been observed that it can also be enabled on older 600 series cards and newer models. To enable it on these cards, users can utilize tools like Nvidia Inspector to create a profile and set the vertical sync option to 0x18888888.
It's important to note that Fast Sync works best when the FPS (frames per second) exceeds the monitor's refresh rate by at least two to three times. Using it under these conditions can help maximize performance and minimize syncing issues in gameplay.