VRR Variable Refresh Rate (HDMI Forum VRR)

What VRR is and why it matters

On a fixed-refresh display, the panel asks the source for a new frame on a strict clock — every 1/60th of a second on a 60 Hz TV, every 1/120th on a 120 Hz one. If the GPU has not finished rendering by that moment, the source has two bad choices: repeat the previous frame (which looks like judder) or push a half-finished frame (which looks like a tear across the screen). The HDMI Forum describes the failure mode plainly: when the GPU does not finish rendering the next frame by the time it needs to be displayed, the source must either repeat the current frame or display the partially-rendered next frame, which causes judder and tearing.

VRR breaks the fixed clock. It was introduced as part of HDMI 2.1, which the HDMI Forum released on November 28, 2017, and it is now one of the gaming-centric features that distinguishes a true HDMI 2.1 chain from an older HDMI 2.0 one.

How VRR works

VRR is source-driven. Rather than the display polling on a fixed clock, the GPU or console transports each frame the moment it is ready. The HDMI Forum describes the model as enabling a gaming source such as a console or computer to deliver video frames as fast as it can; by waiting until the next frame is ready to transport it, a smoother gaming experience is provided to the user.

Each VRR display supports its own range of refresh rates. The HDMI Forum's public VRR page does not publish a specific Hz range as a spec mandate, so the right framing is that the panel sets the window, not the standard. Whether the HDMI Forum spec itself mandates a low-framerate-compensation behavior equivalent to AMD's LFC is not settled by the HDMI Forum's published VRR page.

What happens when the rendered framerate falls below that window is its own problem. AMD's solution is Low Framerate Compensation (LFC): when the framerate of a game is running below the minimum supported refresh rate of a display, the frames are displayed multiple times so the framerate remains in the supported refresh rate of the display and smooth gameplay is maintained. LFC is a mandatory requirement for FreeSync Premium and FreeSync Premium Pro.

vs G-SYNC and FreeSync

NVIDIA's G-SYNC ships in three tiers: G-SYNC, G-SYNC Ultimate, and G-SYNC Compatible. The first two require a dedicated NVIDIA scaler module inside the display and offer a wider variable-refresh window, lower input lag, and variable overdrive. G-SYNC Compatible is something different — it is a certification stamp that NVIDIA puts on displays that implement the open VESA Adaptive-Sync protocol, the same protocol that underlies AMD FreeSync and HDMI Forum VRR. So "G-SYNC Compatible" and "HDMI VRR" are cousins riding the same Adaptive-Sync rails; native G-SYNC is the hardware-module outlier.

AMD FreeSync also has three tiers. Base FreeSync requires certification for low latency and refresh-rate variation. FreeSync Premium adds the LFC mandate plus at least 120 Hz at FHD. FreeSync Premium Pro layers on luminance and wide-color-gamut requirements — it is the HDR tier. FreeSync originally rode on DisplayPort 1.2a's optional Adaptive-Sync feature, and AMD also implemented it over HDMI 1.2+ as a protocol extension, meaning FreeSync over HDMI predates the HDMI 2.1 native VRR mechanism.

This matters most for consoles. Xbox Series X and Series S supported HDMI 2.1 VRR at launch in November 2020, and additionally support AMD FreeSync — so the consoles work both with HDMI 2.1 TVs and with older FreeSync-over-HDMI displays. PlayStation 5 was the opposite story: it shipped without VRR. Sony rolled it out via a global system-software update beginning the week of April 25, 2022, roughly 17 months after launch, with the PlayStation Blog describing the result as: on HDMI 2.1 VRR-compatible TVs and PC monitors, VRR dynamically syncs the refresh rate of the display to the PS5 console's graphical output.

Ecosystem support

NVIDIA's GeForce News page on HDMI 2.1 enumerates the manufacturers shipping HDMI 2.1-capable sets — the prerequisite for HDMI Forum VRR — as LG starting in 2019, Samsung starting in 2020, Philips UK starting in 2020, and Panasonic UK starting in 2023. Many TVs from those vendors carry multiple VRR badges at once (HDMI VRR alongside FreeSync Premium and/or G-SYNC Compatible certification). Which protocol layer actually carries a given console's signal on a given model is a per-model detail this entry does not attempt to settle.

HDMI 2.2, announced January 6, 2025 and released June 25, 2025, introduces the new Ultra96 cable at 96 Gbps and lists VRR among its continuing gaming features, but the HDMI Forum's 2.2 announcement does not publish any update to the VRR Hz range or core mechanism. Treat VRR as carried forward from HDMI 2.1 unchanged in its public specification, not redefined by 2.2.