G-Sync, FreeSync, and V-Sync: How Variable Refresh Rate Works, Tearing, and Latency

The conflict between monitor refresh and GPU output

In PC gaming, visual smoothness is governed by how two separate pieces of hardware exchange image frames: your graphics card (which renders frames at variable speeds depending on scene complexity) and your monitor (which refreshes its panel at fixed, periodic intervals, such as 60, 144, or 240 times per second).

When these two rates fall out of synchronization, players suffer from two persistent problems:

• Screen tearing: Occurs when the GPU pushes a newly finished frame into the display buffer while the monitor is in the middle of scanning lines down the physical panel. The screen draws the top half from the old frame and the bottom half from the new frame, creating a distracting horizontal slice.
• V-Sync input latency: Traditional Vertical Synchronization (V-Sync) solves tearing by forcing the GPU to wait until the monitor completes its vertical blanking interval (VBLANK) before presenting the next frame. However, holding frames in buffer memory introduces twenty to fifty milliseconds of noticeable controller and mouse delay.

Variable Refresh Rate (VRR) technologies—marketed primarily as NVIDIA G-Sync and AMD FreeSync (VESA Adaptive-Sync)—solve this by making the monitor slave to the GPU, altering the panel refresh cycle dynamically on every frame.

Quick-fix configuration matrix

Configuring VRR correctly requires coordinating three distinct software toggles. The table below outlines how common setup configurations impact tearing and input responsiveness:

The optimal setup playbook

To achieve zero screen tearing with the lowest possible input delay, follow this exact configuration workflow:

1. Activate G-Sync / FreeSync in hardware and driver:
   • On NVIDIA systems: Open NVIDIA Control Panel -> Set up G-SYNC -> Check Enable G-SYNC, G-SYNC Compatible -> Select Enable for windowed and full screen mode.
   • On AMD systems: Open AMD Software: Adrenalin Edition -> Gaming -> Display -> Toggle AMD FreeSync to Enabled.
2. Turn driver-level Vertical Sync ON:
   • In NVIDIA Control Panel -> Manage 3D Settings -> Set Vertical sync to On.
   • In your individual game settings: Turn in-game V-Sync OFF. The driver handles frame timing synchronization far more consistently than individual game engines without buffering lag.
3. Impose a strict frame rate cap three frames below your maximum refresh rate:
   • Set the frame limit in the driver: Max Frame Rate in NVIDIA Control Panel or Radeon Chill / Frame Rate Target Control in AMD.
   • For a 144 Hz display: Cap framerate at 141 FPS.
   • For a 165 Hz display: Cap framerate at 162 FPS.
   • For a 240 Hz display: Cap framerate at 236 FPS.
   • Capping three frames below the ceiling prevents the framerate from ever bumping against the maximum panel refresh rate, which would immediately trigger traditional V-Sync backpressure buffer delays.

Resolving multi-monitor stutter and windowed drops

A common long-tail issue occurs on multi-display setups where a high-refresh primary gaming monitor (e.g., 144 Hz) is paired with a secondary 60 Hz monitor used for Discord or video streaming:

• The DWM desktop desynchronization bug: When playing a game in borderless windowed mode while playing a video on the 60 Hz screen, the Windows Desktop Window Manager (DWM) can misinterpret the combined refresh cycle, locking the primary game monitor to 60 Hz or causing severe stutter.
• The remedy: Run the game in Exclusive Fullscreen mode, or open your web browser settings and disable Hardware Acceleration on secondary video playback tasks to keep the Windows display compositor focused on the game pipeline.

When shopping for high-refresh gaming monitors or matching GPU performance targets to display resolutions, checking display compatibility ratings and benchmark setups on 365Finds ensures your hardware pairing stays inside the optimal VRR window.

Diagnostic checklist for VRR operation

If you suspect G-Sync or FreeSync is not functioning during a match:

1. Enable the on-screen refresh rate counter in your monitor's OSD: Access your physical monitor's built-in menu buttons. If VRR is active, the monitor's built-in refresh rate counter will dynamically oscillate in real time alongside your in-game framerate rather than staying fixed.
2. Check display cable specifications: VRR over PC requires DisplayPort 1.2 or higher, or HDMI 2.1 on compatible modern cards and panels. Older HDMI 2.0 cables frequently fail to negotiate Adaptive-Sync handshakes.
3. Verify Windows display refresh settings: Navigate to Windows Settings -> System -> Display -> Advanced display and ensure your panel is set to its maximum rated refresh rate rather than defaulting to 60 Hz.