What is vsync in games

Last updated: April 1, 2026

Quick Answer: VSync (Vertical Synchronization) is a graphics setting that synchronizes a game's frame rate with the monitor's refresh rate to eliminate screen tearing. It matches GPU output to monitor display cycles for smoother visuals.

Key Facts

Overview

VSync is a synchronization technology in gaming that coordinates the output of a graphics processor with a monitor's refresh cycle. Without VSync, the GPU continuously renders frames regardless of when the monitor updates its display, leading to a visual artifact called screen tearing where the monitor displays portions of multiple frames simultaneously.

How VSync Works

Monitors refresh their displays at regular intervals—60 times per second for a 60Hz monitor, 144 times per second for a 144Hz monitor, and so on. VSync forces the GPU to wait for the monitor's refresh signal before outputting a new frame. This ensures each displayed frame is complete and consistent, eliminating the horizontal lines or fragmented images characteristic of screen tearing.

The Input Lag Trade-off

While VSync eliminates screen tearing, it introduces a trade-off: input lag. Input lag is the delay between player input (mouse movement, button press) and the resulting action appearing on screen. When VSync is enabled and the GPU cannot maintain the target refresh rate, frames are held longer, increasing the time before a player sees their action. This can negatively impact competitive gaming performance, especially in fast-paced games like first-person shooters.

Modern Synchronization Technologies

Newer technologies address VSync's limitations. G-Sync (NVIDIA) and FreeSync (AMD) are adaptive synchronization technologies that match the monitor's refresh rate to the GPU's output dynamically. These solutions eliminate both screen tearing and input lag, providing superior performance when available. They require compatible monitors but offer the best of both worlds.

When to Use VSync

VSync benefits single-player games, strategy games, and applications where smooth visuals matter more than responsiveness. Competitive gamers often disable VSync to reduce input lag despite potential screen tearing. The decision depends on individual preferences, game type, and hardware capabilities. Modern variable refresh rate technologies (G-Sync/FreeSync) provide an optimal solution when available.

Related Questions

What is screen tearing?

Screen tearing occurs when the monitor displays parts of multiple frames simultaneously, creating a visible horizontal line or fragmented appearance. This happens when the GPU outputs frames faster than the monitor can display them and VSync is disabled.

What is G-Sync vs FreeSync?

G-Sync and FreeSync are adaptive synchronization technologies that dynamically adjust monitor refresh rates to match GPU output. G-Sync is NVIDIA-exclusive with licensed technology, while FreeSync is AMD's open-source alternative that works with any GPU, typically costing less.

Does VSync affect gaming performance?

VSync itself doesn't reduce FPS but can introduce input lag and frame pacing issues if your GPU cannot maintain the target refresh rate. For best performance, use adaptive sync (G-Sync/FreeSync) if available, or disable VSync for competitive gaming.

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Sources

  1. Wikipedia - Screen Tearing CC-BY-SA-4.0
  2. NVIDIA G-Sync Technology proprietary