G-Sync & FreeSync VRR Range & OLED Gamma Flicker Advisor
Calculate your display's variable refresh rate operating window, Low Framerate Compensation (LFC) boundaries, optimal -3 FPS frame cap targets, and OLED near-black gamma flicker risk.
โ๏ธ Hardware Specification
๐ก๏ธ Why the -3 FPS Limit Eliminates Input Lag
Variable Refresh Rate displays require the GPU to present frames within the hardware timing window. If frame delivery peaks even for a fraction of a millisecond at native max Hz, hardware G-Sync timing buffers revert to driver double-buffered V-Sync. By shaving 3 FPS off the ceiling (or 4 FPS on 360Hz/540Hz displays), you guarantee that frame delivery never touches the top frame-queue boundary.
๐๏ธ Mitigating OLED VRR Gamma Flicker
OLED pixel luminance varies with the duration of the pixel charge cycle. When FPS drops from 240 to 90 during an explosion or traversal stutter, each pixel remains illuminated longer, brightening shadow details artificially. Capping FPS to a stable value that your GPU can sustain 99% of the time drastically suppresses this flicker.
Frequently Asked Questions
Why should I cap my framerate 3 FPS below my monitor refresh rate?
If your FPS hits or exceeds your monitor's maximum refresh rate (e.g., exactly 144 FPS on 144Hz), G-Sync/FreeSync disengages and reverts to standard V-Sync. This introduces a 1 to 2 frame buffer queue, causing an immediate 15ms to 35ms input lag penalty. Capping 3 to 4 FPS below maximum (141 FPS for 144Hz, 237 FPS for 240Hz, 355 FPS for 360Hz) guarantees that the display stays inside the zero-tear, zero-buffer VRR hardware bracket at all times.
What is Low Framerate Compensation (LFC)?
LFC automatically activates when your game FPS drops below the minimum VRR window (typically 40Hz or 48Hz). The GPU frame-doubles or frame-triples output cycles (e.g. at 35 FPS, the monitor refreshes at 70Hz or 105Hz) to prevent screen tearing without triggering V-Sync stutter.
What causes near-black gamma flicker on OLED gaming monitors?
OLED pixels are voltage-calibrated to specific refresh rates. When framerates swing wildly (e.g. jumping between 60 FPS and 240 FPS during stutters or loading screens), the monitor's gamma curve shifts rapidly between 16.6ms and 4.1ms refresh cycles. In dark gaming scenes, this gamma fluctuation appears as subtle brightness pulsing or strobing.
Should I enable V-Sync in the NVIDIA Control Panel with G-Sync?
Yes! The optimal competitive setup recommended by Blur Busters is: G-Sync ON, V-Sync ON in the driver control panel (NVIDIA Control Panel or AMD Adrenalin), V-Sync OFF in the in-game menu, and an in-game or RTSS frame limiter set to Max Hz minus 3.