Topic on User talk:Keith
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Vsync should not be used as a frame limiter in such cases like these.
Reason being is that if you're using a high refresh rate, like you mentioned 120-240 Hz or even 360 Hz which is now a thing, the frame rate will be able to go too high without a real frame rate capping solution. One example of a solution is d3d9 wrapper, which will work independently of any refresh rate you happen to be using.
You can find others listed at the glossary page.