The Screen Tearing Problem
When your graphics card pushes frames faster than your monitor's refresh rate (e.g., your GPU outputs 160 FPS to a 144Hz monitor), you experience screen tearing. This happens because the GPU sends a new frame while the monitor is still drawing the previous one, resulting in a visible "tear" line across the screen.
Historically, gamers used V-Sync (Vertical Sync) to fix this. V-Sync forces the GPU to wait for the monitor to be ready before sending a new frame. While this eliminates tearing, it introduces massive input lag because your mouse clicks are being held back in a buffer.
How VRR Works
Variable Refresh Rate (VRR) technologies flip the V-Sync paradigm. Instead of the GPU waiting for the monitor, the monitor waits for the GPU. If your GPU renders a frame in 8 milliseconds, the monitor adjusts its refresh rate on the fly to display it exactly then. This eliminates screen tearing without the heavy input lag penalty of traditional V-Sync.
G-Sync vs. FreeSync vs. HDMI VRR
There are three main flavors of VRR today:
- Nvidia G-Sync: Originally required a proprietary hardware module inside the monitor. It offers excellent variable overdrive (preventing ghosting at low framerates) and strict certification. "G-Sync Compatible" monitors use standard Adaptive-Sync but have passed Nvidia's validation.
- AMD FreeSync: Built on the open VESA Adaptive-Sync standard. It is generally cheaper because it doesn't require a proprietary hardware module. FreeSync Premium and Premium Pro offer higher refresh rate requirements and HDR support.
- HDMI VRR: The standard implemented in the HDMI 2.1 specification. It is primarily used by modern consoles (PS5, Xbox Series X) and OLED TVs to ensure smooth gaming in the living room.
Optimal FPS Cap Settings
To eliminate tearing while maintaining the absolute lowest input lag, you must follow the Golden Rule of VRR setup:
- Enable G-Sync/FreeSync in your GPU control panel.
- Enable V-Sync in the GPU control panel (NOT in the game menu). This acts as a frame time compensator.
- Cap your frame rate slightly below your monitor's maximum refresh rate.
If you do not cap your frame rate, your FPS will hit the monitor's ceiling, VRR will disengage, and traditional V-Sync behavior will kick in, adding latency.
- For a 144Hz monitor: Cap at 141 FPS
- For a 165Hz monitor: Cap at 162 FPS
- For a 240Hz monitor: Cap at 236 FPS
Latency Measurements
Independent testing by hardware reviewers (like BlurBusters) shows the dramatic difference:
- No Sync, Uncapped: ~15ms system latency (but massive tearing).
- V-Sync ON: ~45ms system latency (smooth, but sluggish response).
- G-Sync + V-Sync ON + FPS Capped: ~16ms system latency (no tearing, virtually identical to uncapped latency).
Using the Calculator
Use our latency tuning calculator to find the exact optimal FPS cap for your monitor's refresh rate and learn how to properly configure your Nvidia Control Panel or AMD Adrenalin software.
