VRR Explained: G-Sync vs FreeSync vs Adaptive-Sync for PC Gaming

G-Sync, FreeSync and Adaptive-Sync all solve the same problem: the monitor waits for each finished frame instead of refreshing on a fixed clock, which removes screen tearing without the stutter and input delay of classic V-Sync. Adaptive-Sync is the open VESA standard, FreeSync is AMD’s certification program built on it, and G-Sync is Nvidia’s branding, either through a dedicated hardware module or as “G-Sync Compatible” on standard Adaptive-Sync panels. For most players the brand matters less than three things: the monitor’s variable refresh range, how it behaves at low frame rates, and whether you cap your frame rate correctly.

What fixed refresh gets wrong

A 144 Hz monitor refreshes every 6.94 ms whether or not your GPU has a new frame ready. If a frame finishes at 9 ms, you have two bad options. With V-Sync off, the GPU swaps the image mid-scan and you see a tear line. With V-Sync on, the frame waits for the next refresh at 13.9 ms, which adds delay, and if your GPU can’t hold 144 fps the display can fall to a divisor of the refresh rate (72 fps, then 48 fps), which reads as judder.

Variable refresh rate (VRR) flips the relationship. The GPU sends a frame, the monitor scans it out right away, and the next refresh timing follows the next frame. At 9 ms per frame the screen simply runs at roughly 111 Hz for that moment. No tear, no waiting for a fixed tick.

The three names, and what each one actually promises

The practical outcome is that Adaptive-Sync monitors work across vendors. GeForce cards from the GTX 10 series onward can run VRR on Adaptive-Sync monitors over DisplayPort, and Radeon cards can do the same. The one exception is a monitor built around the original G-Sync module, which is intended for GeForce cards.

The refresh window and why low framerate compensation matters

Every VRR monitor has a window, such as 48 to 144 Hz. Inside it, the display follows your frame rate. Outside it, behavior changes.

• Above the top of the window: the monitor can’t refresh faster, so VRR stops helping. Frames either tear (V-Sync off) or wait (V-Sync on).
• Below the bottom of the window: without help, the display drops back to fixed behavior, bringing tearing or stutter back.
• With low framerate compensation (LFC): the driver repeats each frame. At 30 fps on a 48 to 144 Hz panel, it shows every frame twice, so the panel runs at 60 Hz inside its window.

LFC needs a window wide enough that the top rate is at least about double the bottom rate. A 48 to 144 Hz window qualifies; a 48 to 75 Hz window does not, so a drop to 40 fps on that panel falls out of VRR entirely. When you read a spec sheet, look at the minimum refresh and check that LFC is supported, not just the maximum.

Hardware module versus validated Adaptive-Sync

The original selling point of the G-Sync module was variable overdrive: the pixel response tuning changes with the current refresh rate, so ghosting stays consistent when frame rate swings. Many modern Adaptive-Sync monitors now handle overdrive adequately across the range, but weaker implementations can still show overshoot (inverse ghosting) at low refresh and smearing at high refresh because the overdrive was tuned for only one speed.

OLED monitors add a different quirk. Because pixel brightness depends on the refresh rate, large swings in frame rate (loading screens, menus, a game that hovers near the bottom of the window) can produce visible brightness flicker. Dark scenes show it most. This is a property of the panel type rather than a G-Sync or FreeSync flaw, and it explains why some people leave VRR off in menus or lock a stable frame rate instead.

Setup that works, with the reason for each step

1. Use the right cable and port. DisplayPort is the safest path for VRR on PC. HDMI works when both the monitor and the GPU support HDMI VRR (HDMI 2.1) or AMD’s FreeSync over HDMI. An older HDMI cable or a port limited to HDMI 2.0 is a common reason the option never appears.
2. Switch VRR on in the monitor menu. The setting is often labeled FreeSync, Adaptive-Sync or VRR and ships disabled on some models. If the driver can’t see it, nothing else will work.
3. Enable it in the GPU driver. On GeForce, open the G-SYNC setup page and tick the enable box for the monitor; choose the mode that covers both windowed and fullscreen if you play borderless. On Radeon, turn on FreeSync under the display settings. Drivers sometimes leave it off by default.
4. Turn V-Sync on in the driver, not the game, when using G-Sync. Within the VRR window, V-Sync adds no wait. It only takes effect at the edge, where it prevents a tear if a frame lands just as the panel hits its maximum.
5. Cap your frame rate a few frames below the refresh rate. About 3 fps under (for example 141 on a 144 Hz panel) keeps the frame rate inside the window, so VRR stays active instead of bumping the ceiling. Use an in-game limiter if it has one, otherwise the driver-level limiter (Max Frame Rate on GeForce, Frame Rate Target Control on Radeon). Reflex and similar low-latency modes apply a cap automatically in supported games.
6. Check Windows graphics settings. The option for optimizations in windowed games lets VRR work in borderless mode for DirectX 10 and 11 titles.
7. Confirm it’s active. Many monitors can show a live refresh rate in the on-screen display. If the number tracks your fps during a game, VRR is running. If it sits at the maximum, it isn’t.

Common problems and fixes

Which one should you pick

Frequently Asked Questions

Can I use a FreeSync monitor with an Nvidia graphics card?

Yes. GeForce cards from the GTX 10 series onward can run variable refresh on Adaptive-Sync monitors over DisplayPort. Nvidia-validated models are listed as G-Sync Compatible, and unlisted monitors can often be enabled manually, though results vary by panel.

Can I use a G-Sync monitor with an AMD graphics card?

Monitors that use the dedicated G-Sync module are designed for GeForce cards, so VRR usually isn’t available on Radeon. G-Sync Compatible monitors are standard Adaptive-Sync panels and work normally with Radeon cards.

Should I leave V-Sync on with G-Sync or FreeSync?

For G-Sync, turning V-Sync on in the driver control panel is the common recommendation because it prevents tearing at the top of the refresh range, and it adds no wait while you stay inside the window. Pair it with a frame rate cap a few below your refresh rate. For FreeSync, the frame rate cap is the key setting; many players leave V-Sync off in the game and rely on the cap.

Does VRR add input lag?

Inside the refresh window, VRR adds no meaningful delay by itself, because each frame is shown as soon as it is ready. Lag appears when you let your frame rate hit the ceiling with V-Sync on and no cap, which queues frames. A cap just under the refresh rate avoids that.

Is VRR worth using if my frame rate is always at the monitor’s maximum?

The benefit shrinks. VRR helps most when fps varies. If a competitive game runs well above your refresh rate, you’re better off prioritizing a cap and low-latency settings, and VRR is a minor extra.

Why does my OLED flicker with VRR on?

OLED brightness response changes with refresh rate, so big swings in frame rate create slight brightness changes, mostly in dark scenes. Stabilizing the frame rate, capping menus, or turning VRR off in the problem game reduces it.