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FreeSync AMD vs G-Sync NVIDIA: Which is better?

One of the best new features found on PC monitors these days is the ability to synchronize the refresh rate of the display with the content played, which reduces visible tearing caused by fluctuations in the frame rate. This is called Adaptive-Sync or variable refresh rate, and it enables a smooth gaming experience free of screen tearing and stutter, even in more demanding games where your computer might not be able to render the game at a higher framerate. There are two main technologies marketed with this feature: FreeSync, which was developed by AMD, and G-Sync, which was developed by NVIDIA. They are essentially the same in function, but there are a few nuances between the two that are worth considering.

AMD FreeSync

What it is: Semi-proprietary standard for Adaptive-Sync, developed by AMD.

Who should buy it: People with AMD Radeon equipped systems or people with less interest in variable refresh rate features.

NVIDIA G-Sync

What it is: NVIDIA proprietary Adaptive-Sync technology.

Who should buy it: People that already own NVIDIA equipped systems.

  FreeSync G-Sync
Implementation Inconsistent Consistent
Connectivity Same as standard monitors Only 1 or 2 inputs
Input Lag Depends on model Low
Graphics Cards AMD GPUs and APUs Only NVIDIA GPUs
Price Same as standard monitors Premium
Availability Great Decent

We'll compare the two technologies in their fundamental philosophy, their support and connectivity, their effect on input lag as well as their overall availability and related future developments.

Implementation

AMD FreeSync

  • Released Royalty-Free under VESA Adaptive-Sync
  • Does not require expensive proprietary hardware
  • Sync range up to manufacturer's discretion

NVIDIA G-Sync

  • Requires expensive NVIDIA-made display interface.
  • G-Sync covers the entire refresh rate down to 30 Hz (even lower with Low Framerate Compensation)

Both technologies refer to the software solution named Vertical Synchronization (or VSync for short) which has been used with display adapters for decades now. VSync works by limiting the application's frame rate to the vertical refresh rate of the monitor and only sending out a new frame when the screen is ready to receive one. Unfortunately, this is not the best solution, since it tends to raise input lag dramatically and often doesn't provide a consistent experience with highly fluctuating framerates.

NVIDIA was the first to propose a hardware solution that would solve tearing whilst retaining the responsiveness and simplicity of unsynchronized displays. This was implemented as an NVIDIA G-Sync module that replaces standard display scalers. All G-Sync features only work with NVIDIA graphics, and are disabled when used with other sources.

AMD's FreeSync is essentially the same concept, but instead of requiring expensive proprietary hardware, it works on traditional off-the-shelf components. This gives the advantage of not increasing the costs of the hardware but also allows manufacturers to easily adapt existing designs (hence "Free"). This sounds great in theory, but in practice, it means that the FreeSync implementation is entirely up to the manufacturer. It is often the case that certain monitors only support the feature within a limited frequency range, reducing the usefulness of it.

Winner: G-Sync. While it is more expensive, it offers a standardized experience across devices.

Connectivity and Input Lag

AMD FreeSync

  • No limits for inputs.
  • Input lag depends on the manufacturer's design.
  • Variable refresh rate eliminates stutters.
  • Works over HDMI

NVIDIA G-Sync

  • Most of the monitors only have a single input.
  • Low input lag thanks to the gaming-focused G-Sync module.
  • Variable refresh rate eliminates stutters.

Since all G-Sync monitors use the same NVIDIA-made hardware which was designed from the ground up to be focused on gaming, they all have low input lag. FreeSync monitors, on the other hand, are in the same position as standard non-adaptive monitors. It doesn't mean that FreeSync screens have inherently higher input lag, but you'll have to look at reviews for an input lag measurement before making your purchase.

The use of generic hardware has an advantage though. G-Sync modules only support 1 to 2 inputs, depending on the generation. Newer ones that do feature an HDMI port in addition to DP 1.2 are still quite limited since it's only HDMI 1.4, which can be bandwidth constrained at higher refresh rates or resolutions, and it doesn't have G-Sync functionality. FreeSync monitors can have as many inputs as the manufacturer desires, including legacy ports such as VGA or DVI (FreeSync however only works on HDMI or DP). Unlike G-SYNC, Freesync is supported over HDMI, but unlike DisplayPort, FreeSync over HDMI is not yet an Open Standard, so it only officially works on AMD graphics. 

Winner: Freesync. While G-Sync offers the certainty of low input lag, Freesync offers more versatility which is useful for those that plan to use their monitor with multiple devices.

Learn more about input lag.

Supported Graphics Cards

  FreeSync G-Sync
AMD R7 Series and Above Yes No
AMD RX Series Yes No
AMD 6th Generation APU and Newer Yes No
NVIDIA GTX 650 Ti and Above No Yes
NVIDIA GTX 960M and Above No Yes

Due to its proprietary nature, G-Sync can only be used with NVIDIA Graphics cards. It's a pretty mature technology, so as long as you've bought your NVIDIA equipped computer in the past 3 to 4 years, it's very likely that it will support it.

AMD released the FreeSync protocol for open use through the VESA consortium as an official part of the DisplayPort interface, so anybody, including competitors NVIDIA and Intel, can use the open Adaptive-Sync standard for their devices (due to inherent limitations, NVIDIA actually uses the open standard for G-Sync equipped laptops). "FreeSync" is mostly used for marketing and requires a certification and licensing from AMD for use. At this point, only AMD is using this standard, so the support is about equivalent between the two, but AMD does have the advantage of also supporting it on their Radeon graphics equipped series of APUs. With the arrival of Variable Refresh Rate support on the upcoming HDMI 2.1 standard, it will also make its way to TVs of the future.

The full list of FreeSync capable devices can be found here, and G-Sync capable devices here.

Winner: FreeSync. While the current support of the two is quite similar, it is likely that other companies such as Intel will use the standard in their upcoming products, rendering existing FreeSync displays more versatile.

Future Developments and Additional Features

AMD FreeSync

  • Low framerate compensation
  • Windowed mode support
  • Hardware addressing HDR API

NVIDIA G-Sync

  • Low framerate compensation
  • Windowed mode support
  • ULMB (Backlight Flicker)
  • Variable overdrive

While FreeSync is almost entirely aimed at simply being a more accessible method for variable refresh rates, G-Sync aims more towards being an ecosystem for high-end gaming monitors to offer the best possible experience. As with most things, it doesn't mean a FreeSync monitor can't match a G-Sync model, but every G-Sync display comes with a default set of premium features.

First and possibly most important is the Ultra Low Motion Blur feature (ULMB for short), which is NVIDIA's name for its image flicker / black frame insertion feature, which greatly enhances motion clarity. While it is currently impossible to use in conjunction with G-Sync, it's still a great feature that isn't found on most FreeSync monitors.

Another feature that is found on every G-Sync monitor is "Variable Overdrive". Effectively, it adjusts the monitor's overshoot setting for every refresh rate to reduce motion blur. Most monitors feature overshoot adjustments, but they tend to be automatically disabled when FreeSync is turned on since they're only really designed for a specific refresh rate. We've yet to see a FreeSync monitor that includes a similar feature. 

AMD and NVIDIA also recently announced new versions of their technologies, FreeSync 2 and G-Sync HDR. G-Sync HDR is basically a certification process for high-end HDR PC monitors while FreeSync 2 also adds an API that allows graphics cards to take over some of the tone mapping tasks usually done by the display itself, which according to them could possibly reduce input lag. Due to the simplicity of these tasks though, we don't expect it to be a significant advantage.

Winner: G-Sync

Pricing and Availability

You probably have noticed a recurring theme when comparing the two technologies. G-Sync tends to offer a more feature-packed and polished experience than FreeSync, but it also comes at a significant premium. Most manufacturers that produce G-Sync monitors often also make a quasi-identical FreeSync variant using the same design. This is really helpful since it allows us to do direct price comparisons and figure out how much the G-Sync module tends to add to the price.

When we compared a sample of 14 monitors (7 pairs), the average price difference between the FreeSync and G-Sync variants was $192.30. Now, due to our small sample size and a variety of other factors out of our control, it isn't an absolute number, but it's in line with what we'd expect. When G-Sync first launched, it was available as a DIY kit for upgrading an existing Asus monitor, and it cost $199 to purchase from NVIDIA.

What's also important to note is the wide support for FreeSync thanks to its minimal implementation costs. Looking forward, it isn't far-fetched to expect every new "standard" monitor to feature some form of adaptive sync, while G-Sync will be reserved for a select list of premium-oriented gaming monitors. A good way to see this is the number of models found in retailers. Newegg.com, at the time of this writing, stocks 29 G-Sync monitors, but the FreeSync number is a significantly larger 78.

Winner: FreeSync. Due to its open nature and minimal additional costs for manufacturers, FreeSync capable monitors tend to be both easier to find and less expensive than G-Sync models.

Conclusion

Depending on your needs and preferences, you'll find that there is no clear winner between the two technologies. In most cases, your best choice is picking the technology that works with your computer: G-Sync if you have an Nvidia graphics card, and FreeSync if you have an AMD graphics card. If comparing them directly, the most important feature works exactly the same on both, but G-Sync tends to offer a more polished and consistent platform for a premium (which means that the best monitors around are mostly G-Sync), while capabilities can vary wildly between the wide range of FreeSync models found in every price range.

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Questions & Answers

3 ANSWERED QUESTIONS
3
Did you guys use any specific games to make this decision? also what types of graphics cards were used? Both of these programs are designed for gaming and i think your review missed mentioning using it while gaming at all
We did not use any specific game while making this article. We have a few graphics cards in our lab including an NVIDIA GTX 1060 and a Radeon RX 580 that we use for testing. It is true that the article isn't very explicit about how gaming-centric this feature is, so I've updated the introduction to clarify a little about its main purpose.
0
Excellent rundown over the two technologies. Certainly the best summary I've seen on this. Will you guys also do an overview of the various motion blur reducing technologies? I've been curious about how the most recently announced ones stack up to ULMB.
Possibly. The major differences between them are the frequencies supported and the strobe crosstalk; for example the Samsung CFG70 has a four zone backlight to eliminate crosstalk, and many BenQ monitors have customizable pulse timing that users can tune to reduce crosstalk. Also a future G-Sync implementation is rumored to support both G-Sync and ULMB at the same time, aka variable refresh rate black frame insertion, which would be amazing. We will certainly write a test article for black frame insertion that touches on these different implementations, but we may write a more in depth comparison article in the future. We are also thinking of adding a crosstalk test to the scoring, stay tuned.
0
In 2018, is it possible to see TVs (LG, Sony, Samsung, etc) that support AMD FreeSync?
It is possible, as FreeSync supports an HDMI connection. Since TV manufacturers have shown little interest in this technology in the past, we don't really expect them to. HDMI 2.1 is supposedly implementing Variable Refresh Rate support which should be compatible with FreeSync, but we forecast that TVs with this connector will only start appearing in 2019.
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