CONFIRMED: nVidia G-SYNC includes a strobe backlight upgrade!

When Andy of nVidia was asked whether LightBoost could be combined with G-GSYNC, AndyBNV of nVidia confirmed on NeoGaf:

“We have a superior, low-persistence mode that should outperform that unofficial [LightBoost] implementation, and importantly, it will be available on every G-SYNC monitor. Details will be available at a later date.”.

This scientifically confirms strobing is used, because of law of physics related to display persistence, there is no other way to do LightBoost-matching low-persistence modes without ultrahigh refresh rates (e.g. 1000fps@1000Hz) or frame interpolation (e.g. 200fps->1000fps). Since both are unlikely with nVidia G-SYNC, this officially confirms backlight strobing. In addition, John Carmack confirmed on twitter a better backlight strobe driver is included:

John Carmack (@ID_AA_Carmack) tweeted:
“@GuerillaDawg the didn’t talk about it, but this includes an improved lightboost driver, but it is currently a choice — gsync or flashed.”

Both statements by Andy and John, are confirmations that official backlight strobing (LightBoost) is part of G-SYNC, a 2D motion blur elimination, finally officially sanctioned by nVidia. The question becomes: Can both be combined into adaptive-rate backlight strobing without visible flicker?

It is currently a selectable choice:
G-SYNC Mode: Better for variable framerates (eliminate stutters/tearing, more blur)
Strobe Mode: Better for constant max framerates (e.g. 120fps @ 120Hz, eliminates blur)

UPDATE: Your existing ASUS VG248QE monitor is already upgradeable to G-SYNC!
UPDATE2: The name of this mode is called Ultra Low Motion Blur (ULMB).

About Chief Blur Buster

Chief Blur Buster

13 comments on “CONFIRMED: nVidia G-SYNC includes a strobe backlight upgrade!

  1. Pingback: Anonymous

  2. Chief Blur Buster says:

    For those who are asking about it:
    G-Sync looks better for fluctuating frame rates.
    LightBoost looks better for 120fps@120Hz locked.

    They both have their pros and cons.
    — LightBoost is greatly hurt by stutters. Excellent motion clarity makes it much easier to see stutters at much higher framerates. So fluctuating framerates can look very jittery with LightBoost. LightBoost always looks better with locked framerates (120fps @ 120Hz VSYNC ON, or 100fps @ 100Hz VSYNC ON)
    — G-Sync is bottlenecked by 6.9ms of motion blur due to the 144fps sample-and-hold effect (explanation), so you’ll always get a minimum of about 7 pixels of motion blurring during 1000 pixels/sec motion. LightBoost has about 1.4ms of persistence, so you see less than 2 pixels of motion blurring during 1000 pixels/sec.

    (1ms of persistence = 1 pixel of motion blur during 1000 pixels/sec).

    • diabloplayer75 says:

      Would you say then that I am better off using a current 120hz monitor w/ lightboost on than trying to use Gsync for similar effects? (Since gsync cant be used in conjunction with its built inlightboost)

      Or is Gsync geared towards IPS monitors?

      On that note – I’m considering a 120hz IPS monitor 1440p – do they have anything that can simulate the reduced motion blur that you’re after?

      • Chief Blur Buster says:

        There are advantages of a G-SYNC monitor:
        — Improved sequel to LightBoost (better colors, etc)
        — Ability to use G-SYNC optionally to eliminate stutters/tearing in situations where it’s more important than motion blur (e.g. games with highly variable frame rates)

        Also, bear in mind that a 120Hz non-strobed monitor (IPS) will have at least 6x more motion blur than LightBoost. If less motion blur is important to you, keep an eye on LightBoost, Eizo Turbo240, G-SYNC optional strobe mode, BENQ Blur Reduction, or any other upcoming strobe backlight.

        For photographic examples of how strobe backlights can eliminate motion blur, see PHOTOS: 60Hz vs 120Hz vs LightBoost.

  3. Pingback: ASUS Announces G-SYNC Version of the VG248QE - Page 2 - Hardware Canucks

  4. PanzerIV says:

    Hmm good to know so G-Sync will let you choose between the two. I still prefer though the strobbing as what annoys me the most isn’t the tearing but much more the motion blur! It’s also nice to know that they say the implementation of the strobbing will be better and this time more “official” so perhaps we will finaly get good colors while using this strobbing mode as right now I’m too scared to buy either a VG248QE or a XL2420TE.

    People say about the Asus that it got horrible colors which are even worse with Lightboost while some other says the BenQ got bad ghosting and other things when using LB. Then there is the Samsung which got better colors but much worse input lag according to you, like 20-30ms vs <5ms :/ Either way around I get screwed from what I understand. It's a shame that there is no glossy lightboost monitors. I almost bought a VG236H for 200$ but it didn't support LB.

    • Chief Blur Buster says:

      The newer XL2420TE is currently the best LightBoost monitor for 24″ LightBoost quality. On the other hand, the VG248QE is upgradeable to GSYNC. Or you can also wait for one of any of the upcoming strobe-backlight monitors (G-SYNC low-persistence strobe mode, or EIZO FG2421 Turbo240 Mode, or BENQ Blur Reduction Mode), all of which will almost certainly have superior colors to typical LightBoost monitors.

      There’s always a perpetual debate between waiting and buying today — always a personal decision: Buy now or wait?

  5. Whitestar says:

    It’s a shame that you have to choose between Lightboost and G-sync though.

    There really isn’t a CPU-GPU combo in existence that can sustain 120fps or even 100fps in all games at max resolution. Which means that you have to choose between blur and stutter.

    Would be nice of the two could be combined, or if Lightboost somehow could be made to work at say 60Hz.

    • Chief Blur Buster says:

      The simplest solution, for G-SYNC, for now:
      — If you run at less than 100fps or your framerate fluctuates, G-SYNC variable mode will often looks better
      — If you run at more than 100fps and your framerate is stable, G-SYNC strobing mode will often look better

      Even within strobed mode, VSYNC ON looks significantly better during strobing because one strobe per frame produces the most ideal strobing effect. This can add a bit of input lag in exchange for the world’s best CRT-like motion clarity (strobed 120fps VSYNC ON + 1000Hz mouse, to get same game fluidity as

      • yakapo says:

        I typically avoid fps games as they give me motion sickness headaches. Strangely I’m less sensitive to fps games such as halo when playing them on consoles. I’m not sure if its the blurring or the stuttering that’s causing my nausea. However I’ve read elseswhere that people with similar issues to mine have had zero issues when using lightboost.

        I think my plan is to pick up the asus monitor that will support g sync. That way I can try out lightboost and then later try out g sync.

  6. Pingback: PC Gaming 101: Part 5: Gaming Monitor Buyer's guide - SHRIVIEWS

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