Credit: AMDAMD FreeSync is a type of adaptive sync technology for displays, namely PC monitors, gaming laptop screens and certain TVs. The feature helps displays avoid screen tearing, as well as stuttering and juddering by synchronizing the panel’s refresh rate with the framerate from the GPU. FreeSync is the AMD alternative to Nvidia G-Sync. FreeSync 2 HDR is the newest version of the technology and adds support for HDR content.
Screen tearing is an unwelcome effect on the display image (see photo above), which makes on-screen objects look disjointed. It’s the result of the game’s framerate (the rate at which frames of an image are displayed) not matching the monitor’s refresh rate (the frequency at which a display’s image is refreshed).
FreeSync gives your display a variable, aka dynamic, refresh rate (VRR / DRR). The feature makes the display’s refresh rate match your AMD Radeon graphics card’s framerate. FreeSync supports refresh rates up to 240Hz, depending on the monitor. This way, you can enjoy the maximum framerate your graphics card is capable of achieving. If you have a keen enough eye, you may also notice better input latency, or the delay between when you move your mouse and when the cursor actually moves.
However, if you seek max framerates that are greater than your monitor’s refresh rate, you may still see some tearing—even with FreeSync on.
Both versions of FreeSync are based on VESA’s Adaptive Sync protocol, so it works over both DisplayPort and HDMI. For a display to be FreeSync-certified, it has to pass AMD’s own testing process, which looks at its Adaptive Sync support range, luminance / brightness, color range and more.
FreeSync vs. FreeSync 2 HDR
Credit: AMD FreeSync 2 is the second generation of FreeSync and can be found in newer gaming monitors. Both FreeSync and FreeSync 2 are meant to reduce tearing and stuttering, but FreeSync 2 allows you to use the DRR for HDR content. FreeSync 2 won’t work with a non-HDR monitor. And some HDR monitors have regular FreeSync only.
FreeSync 2 came out in 2017, while FreeSync launched in 2015. So there are more FreeSync than FreeSync 2 monitors currently available. But with HDR gaining steam, we can expect to continue seeing more FreeSync 2 monitors on the market. We’ve already reviewed a few, including the AOC Agon AG322QC4 and LG 34GK950F.
|FreeSync||FreeSync 2 HDR|
|Ability to toggle between SDR and HDR||No||Yes|
|Low Framerate Compensation (LFC)||Optional||Required|
|DisplayPort and HDMI support||Yes||Yes|
Another difference between FreeSync and FreeSync 2 is that with FreeSync 2, if your framerate falls below the supported range of your monitor, low framerate compensation (LFC) is automatically enabled to fight tearing and stuttering.
Check out AMD’s video below for an idea of what using FreeSync 2 looks like:
FreeSync vs G-Sync
FreeSync is AMD’s take on adaptive sync, while G-Sync is Nvidia’s. Just like you need an AMD graphics card to use FreeSync, you typically needed an Nvidia graphics card to use G-Sync. However, in January Nvidia changed this rule by approving 12 FreeSync monitors to run G-Sync.
FreeSync is built on an open standard. Contrastingly, to use G-Sync, monitor vendors have to pay for Nvidia's proprietary chip, which replaces the scaler they'd typically buy. As a result, FreeSync monitors are usually cheaper than G-Sync ones. When exploring monitors at the CES tech trade show in January, we noticed a lot of FreeSync monitors coming out, but fewer G-Sync ones. Budget concerns for both vendors and customers is likely the cause.
When it comes to 4K, FreeSync maxes out at 60Hz, while G-Sync can go to 144Hz. Finally, there are no G-Sync TVs on the market currently.
For a detailed exploration of the performance differences between FreeSync and G-Sync, see our AMD FreeSync vs. Nvidia G-Sync article.
FreeSync monitors: What you’ll need
You can find a list of FreeSync-certified monitors here.
To use FreeSync with your PC monitor, you’ll need a FreeSync-certified monitor and a PC running a compatible AMD Radeon graphics card with a DisplayPort connection, plus the compatible Radeon Software graphics driver.
- Radeon VII
- Radeon RX Vega 64
- Radeon RX Vega 56
- Radeon RX 590
- Radeon RX 580
- Radeon RX 570
- Radeon RX 560
- Radeon RX 550
- Radeon RX 480
- Radeon RX 470
- Radeon RX 460
- Radeon RX 450
Gaming monitors typically come with either FreeSync, FreeSync 2 or G-Sync. Some general use and professional monitors also offer FreeSync. If you buy a monitor with 4K resolution (aka UHD) and FreeSync, note that the FreeSync will be limited to a 60Hz max refresh rate.
To use a monitor’s FreeSync, you have to turn it on in AMD Radeon Settings.
FreeSync gaming laptops
Some gaming laptops running AMD graphics have FreeSync built into the display. They’ll say so on their spec sheet.
To use a gaming laptop’s built-in FreeSync, you’ll need to download the latest AMD FreeSync driver.
A small number of Samsung TVs offer FreeSync. To use it, you have to have up-to-date TV firmware and connect the TV to a supporting device, either a gaming PC (with an AMD Radeon graphics card), Xbox One X or Xbox One S (no PlayStations).
This article is part of the Tom's Hardware Glossary.