HFR on LG OLED: Frame Rate, 120 Hz and VRR Explained

Quick Answer

High Frame Rate (HFR) means content is produced or rendered at a higher frame rate than traditional film or television. A game rendering at 120 frames per second can update motion more often than a 60 fps game, but the complete chain must support that output.

Four terms that are easy to mix up

Frame rate: how many frames the source renders each second.

Refresh rate: how often the TV updates its panel.

VRR: lets a compatible display vary refresh timing with the source to reduce tearing and uneven delivery.

ALLM: lets a source request a low-latency display mode; it does not increase frame rate.

A “120 Hz TV” does not guarantee every port, resolution, HDR format or chroma mode works at 120 Hz. Check the exact LG model documentation, use a compatible source and cable, and confirm the console or computer reports the intended output.

PS5 and Xbox Series consoles expose supported high-refresh modes on a game-by-game basis. A PC additionally depends on its GPU, driver, port and selected signal format. The LG C4 and G4 can support higher PC refresh configurations in particular modes, but that should not be generalized to earlier models or consoles.

HFR improves temporal resolution only when the content supplies the extra frames. Motion interpolation is different because the TV creates intermediate frames.

Temporal resolution in practice

At 60 fps, a new frame arrives roughly every 16.7 ms; at 120 fps, about every 8.3 ms. With matching refresh, controls can be sampled and represented sooner and moving objects advance in smaller steps. That can improve clarity and responsiveness, but only when the game engine actually renders new frames.

A 30 fps game sent inside a 120 Hz signal repeats frames. The TV reports 120 Hz, yet temporal detail remains 30 fps. Likewise, a 120 Hz desktop does not make a 24 fps film native HFR.

Fixed refresh, VRR and ALLM

Fixed 120 Hz updates on a regular cadence. VRR lets refresh intervals follow frame delivery within a supported range, reducing tearing and judder from mismatched cadence. Below the range, Low Frame Rate Compensation may duplicate frames.

ALLM merely requests a low-latency picture path. It can accompany 60 Hz, 120 Hz or VRR and does not generate performance. Game Optimizer is the TV mode; the console/game still controls rendering.

HDMI chain requirements

4K120 HDR requires compatible source output, GPU/console, port, cable, television input and any receiver/switch. Establish direct 4K60, enable the LG enhanced/Deep Color input state, add 120 Hz, then HDR and VRR. A cable working at 4K60 is not conclusive at higher data rate.

On PC, chroma and bit depth consume link bandwidth. Select a supported combination rather than the largest numbers. Console capability pages are stronger evidence than a game's menu label.

Content choices

Competitive games often trade resolution or effects for 120 fps. A quality mode may remain 30/40/60 fps. Choose based on visual detail, responsiveness and stable frame time. An unstable 100 fps can feel worse than a stable 60 fps despite the higher average.

For sports or film, native acquisition rate matters. Interpolation can create synthetic HFR appearance but may introduce artifacts and does not turn the production into native capture.

HFR FAQ

Is 120 Hz always lower latency?

It reduces the refresh interval, but game rendering, processing and controller pipeline still contribute.

Does VRR increase FPS?

No. It synchronizes display timing to frames the source already renders.

Why does a 120 Hz game look like 60?

The title may not be in performance mode, output may be 60 Hz, or frame rate may fail to reach the target.

Can C1/C2 run 144 Hz?

No. Do not generalize later PC-oriented 144 Hz support backward; C1/C2 gaming targets up to 120 Hz.

Frame-time consistency matters

Average frame rate hides delivery. Sixty frames arriving every 16.7 ms look smoother than alternating very short and long intervals with the same average. VRR can remove tearing from moderate variation, but it cannot repair a game-engine stall. On OLED, large interval swings can also expose near-black VRR flicker.

Use a frame-time graph when diagnosing. Lowering a CPU-heavy option or setting a sustainable cap can improve motion more than chasing the maximum counter value.

HFR signal verification

On Xbox, read 4K TV Details and the game's performance mode. On PS5, inspect current video output. On Windows, Advanced Display distinguishes desktop and active signal. The LG Game Optimizer information panel can corroborate refresh/VRR, but a rapidly changing number should not be mistaken for rendered FPS in every implementation.

Do not use a camera's slow-motion recording as the only proof; shutter interaction can create bands or duplicated frames.

HFR and image quality modes

Console games commonly offer a resolution/quality mode and a performance/HFR mode. Performance may lower internal resolution, ray tracing, crowd density or other effects to reach a higher frame rate. The television cannot restore detail the game elects not to render. Conversely, selecting a quality mode is not a failure of the TV's 120 Hz support.

Judge a stable gameplay section, input response and visible detail. A mode name describes the developer's target, not assured locked performance.