FreeSync Features

In many ways FreeSync and G-SYNC are comparable. Both refresh the display as soon as a new frame is available, at least within their normal range of refresh rates. There are differences in how this is accomplished, however.

G-SYNC uses a proprietary module that replaces the normal scaler hardware in a display. Besides cost factors, this means that any company looking to make a G-SYNC display has to buy that module from NVIDIA. Of course the reason NVIDIA went with a proprietary module was because adaptive sync didn’t exist when they started working on G-SYNC, so they had to create their own protocol. Basically, the G-SYNC module controls all the regular core features of the display like the OSD, but it’s not as full featured as a “normal” scaler.

In contrast, as part of the DisplayPort 1.2a standard, Adaptive Sync (which is what AMD uses to enable FreeSync) will likely become part of many future displays. The major scaler companies (Realtek, Novatek, and MStar) have all announced support for Adaptive Sync, and it appears most of the changes required to support the standard could be accomplished via firmware updates. That means even if a display vendor doesn’t have a vested interest in making a FreeSync branded display, we could see future displays that still work with FreeSync.

Having FreeSync integrated into most scalers has other benefits as well. All the normal OSD controls are available, and the displays can support multiple inputs – though FreeSync of course requires the use of DisplayPort as Adaptive Sync doesn’t work with DVI, HDMI, or VGA (DSUB). AMD mentions in one of their slides that G-SYNC also lacks support for audio input over DisplayPort, and there’s mention of color processing as well, though this is somewhat misleading. NVIDIA's G-SYNC module supports color LUTs (Look Up Tables), but they don't support multiple color options like the "Warm, Cool, Movie, User, etc." modes that many displays have; NVIDIA states that the focus is on properly producing sRGB content, and so far the G-SYNC displays we've looked at have done quite well in this regard. We’ll look at the “Performance Penalty” aspect as well on the next page.

One other feature that differentiates FreeSync from G-SYNC is how things are handled when the frame rate is outside of the dynamic refresh range. With G-SYNC enabled, the system will behave as though VSYNC is enabled when frame rates are either above or below the dynamic range; NVIDIA's goal was to have no tearing, ever. That means if you drop below 30FPS, you can get the stutter associated with VSYNC while going above 60Hz/144Hz (depending on the display) is not possible – the frame rate is capped. Admittedly, neither situation is a huge problem, but AMD provides an alternative with FreeSync.

Instead of always behaving as though VSYNC is on, FreeSync can revert to either VSYNC off or VSYNC on behavior if your frame rates are too high/low. With VSYNC off, you could still get image tearing but at higher frame rates there would be a reduction in input latency. Again, this isn't necessarily a big flaw with G-SYNC – and I’d assume NVIDIA could probably rework the drivers to change the behavior if needed – but having choice is never a bad thing.

There’s another aspect to consider with FreeSync that might be interesting: as an open standard, it could potentially find its way into notebooks sooner than G-SYNC. We have yet to see any shipping G-SYNC enabled laptops, and it’s unlikely most notebooks manufacturers would be willing to pay $200 or even $100 extra to get a G-SYNC module into a notebook, and there's the question of power requirements. Then again, earlier this year there was an inadvertent leak of some alpha drivers that allowed G-SYNC to function on the ASUS G751j notebook without a G-SYNC module, so it’s clear NVIDIA is investigating other options.

While NVIDIA may do G-SYNC without a module for notebooks, there are still other questions. With many notebooks using a form of dynamic switchable graphics (Optimus and Enduro), support for Adaptive Sync by the Intel processor graphics could certainly help. NVIDIA might work with Intel to make G-SYNC work (though it’s worth pointing out that the ASUS G751 doesn’t support Optimus so it’s not a problem with that notebook), and AMD might be able to convince Intel to adopt DP Adaptive Sync, but to date neither has happened. There’s no clear direction yet but there’s definitely a market for adaptive refresh in laptops, as many are unable to reach 60+ FPS at high quality settings.

FreeSync Displays and Pricing FreeSync vs. G-SYNC Performance
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  • testbug00 - Thursday, March 19, 2015 - link

    Huh? It's just the brand that AMD is putting on adaptive sync for their GPUs. ??? Reply
  • farhadd - Friday, March 20, 2015 - link

    I would never buy a Gsync monitor because I want GPU flexibility down the road. Period. Unfortunately, with no assurance from Nvidia that they might support Freesync down the road, I'm afraid to invest in a Freesync monitor either. Both sides lose. Reply
  • just4U - Friday, March 20, 2015 - link

    "Not sure why people are bashing Gsync"
    --------

    It's not a open standard. That's the main reason to bash it.
    Reply
  • JonnyDough - Monday, March 23, 2015 - link

    NVidia can state what they want. So can Apple. Companies that refuse to create standards with other companies for the benefit of the consumer will pay the price with actual money. This is part of why I buy AMD and not Nvidia products. I got tired of the lies, the schemes, and the confusion that they like to throw at those that fund them. Reply
  • medi03 - Wednesday, March 25, 2015 - link

    Paying 100$+ premium, being locked-in to a single manufacturer, having only a single input port on a monitor is "fantastic" indeed. Reply
  • DigitalFreak - Thursday, March 19, 2015 - link

    Your mom called. She said you need to clean your room. Reply
  • anubis44 - Tuesday, March 24, 2015 - link

    @DigitalFreak: So your response to an intelligently argued point about not supporting a company that imposes proprietary standards is to say 'your mom called?' You're clearly a genius, aren't you? Reply
  • SetiroN - Thursday, March 19, 2015 - link

    I'm disappointed Anandtech is forgetting this:
    there's a fundamental difference between G-Sync and freesync, which justifies the custom hardware and makes it worth it compared to something I'd rather stay without: freesync requires v-sync to be active and is plagued with the additional latency that comes with it, gsync replaces it entirely.

    Considering that the main reason anyone would want adaptive sync is to play decently even when the framerate dips at 30-40fps, where the 3 v-synced, pre-rendered frames account for a huge 30-40ms latency, AMD can shove its free solution up its arse as far as I'm concerned.

    I'd rather have tearing and no latency, or no tearing and acceptable latency at lower settings (to allow me to play at 60fps), both of which don't require a new monitor.

    For the considerable benefit of playing at lower-than-60 fps without tearing AND no additional latency, I'll gladly pay the nvidia premium (as soon as 4K 120Hz IPS will be available).
    Reply
  • FriendlyUser - Thursday, March 19, 2015 - link

    Did you read the article? Of course not! VSync On or Off only comes into play when outside the refresh rate range of the monitor and is an option that GSync does not have. If you have GSync you are force into VSync On when outside the refresh range of the monitor. Reply
  • 200380051 - Thursday, March 19, 2015 - link

    No, it'S the other way around. Freesync does not require V-Sync; you can actually choose, and it will impact the stuttering/tearing or display latency. OTOH, G-Sync does exactly what you said : V-Sync on, when outside of dynamic sync range. Read more carefully, pal. Reply

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