What Is G-Sync ULMB

What Is G-Sync ULMB?

Traditional monitors operate at a fixed refresh rate, commonly 60Hz, 120Hz, or 144Hz.

In games, the frame rate (amount of generated frames per second) fluctuates accordingly to the intensity of the work required by the graphics card.

This introduces a dilemma for gamers in particular. They can usually choose one of two main options that determine how the graphics card passes frames to the monitor: “VSync OFF” or “VSync ON”.

  • VSYNC OFF: The GPU sends frames to the monitor as soon as they are rendered, whether or not the monitor has finished its refresh and is ready to move on to the next frame.
    This will cause screen tearing (picture below) if things become unsynchronized, even on a 120Hz or 144Hz display.
  • VSYNC ON:  The GPU holds the frame until the monitor is ready to display it. This will eliminate screen tearing but will increase input lag. This GPU even happens on 120Hz and 144Hz monitors, but the input lag penalty is much shorter on these displays. If you have a great GPU, then input lag with this option will not be a significant problem.


What Is G-Sync ULMB

The solution: NVIDIA G-SYNC

The clever heads at NVIDIA have come up with a solution to the input lag problem with the “VSYNC ON” option: G-SYNC.

It is possible to get the monitor to adopt a variable refresh rate by integrating a so-called G-SYNC chip into specific monitors.

The monitor’s refresh rate will then adjust in real-time to the frame rate of the game, up to the maximum refresh rate of the monitor, making it perfectly synchronized with the GPU.

You will not get screen tearing or visual latency, you typically know from having VSYNC disabled.

You won’t get the stuttering and input lag associated with VSYNC enabled either. This is why we think the best gaming monitor should feature this technology or another Adaptive-Sync technology.

G-SYNC only works via DisplayPort and to use it, you need a compatible monitor and GPU (NVIDIA GeForce GTX 650 Ti Boost or higher).

This will not work with an AMD GPU, but AMD has its own version labeled FreeSync.

Major monitor manufacturers are extremely excited about this innovative technology. AOC, ACER, ASUS, BenQ, Philips, and ViewSonic all plan to release PC monitors with G-SYNC or they already have.

We will see a lot more of this kind of display in the future, I promise you that! Some models will even have QHD (2560 x 1440) and UHD (3840 x 2160) resolution.

G-SYNC is not limited to TN panels, so we will also see monitors with IPS panels with this technology built-in them.

G-SYNC and motion blur

While G-SYNC will provide a smoother gameplay experience by eliminating screen tearing, reducing stuttering, and decreasing input lag, it does not affect motion blur.

Many gamers already use LightBoost, if they have a compatible monitor, but it is meant for 3D Vision and requires forced activation for 2D.

What Is G-Sync ULMB for you CRT-like motion clarity but reduces brightness?

The good news is that all G-SYNC monitors will have a mode, which is superior to LightBoost, called ULMB (Ultra Low Motion Blur) available. However, it can not be activated at the same time as G-SYNC.

Confirmed G-SYNC monitors

This is a list of monitors, which have or will have the G-SYNC technology.

MonitorSizeResolutionRefresh Rate
Acer XB270HU27"2560x1440 IPS144Hz
Acer Predator XB271HU27"2560x1440 IPS165Hz
Acer Predator X3434"3440x1440 IPS100Hz
Acer XB280HK28"3840x2160 TN60Hz
Acer Predator XB241YU24"2560x1440 TN144Hz
Acer XB270HAbprz27"1920x1080 TN144Hz
Acer XB240H24"1920x1080 TN144Hz
Acer XB271HK27"3840x2160 IPS60Hz
Acer XB321HK32"3840x2160 IPS60Hz
Acer XB281HK28"3840x2160 TN60Hz
Acer Predator Z3535"2560x1080 VA200Hz
Acer Predator X2727"3840x2160 IPS144Hz
Acer Predator Z271T27"1920x1080 VA144Hz
Acer Predator XB251HQT25"1920x1080 TN240Hz
Acer Predator XB252Q24"1920x1080 TN240Hz
Acer Predator Z301C30"2560x1080 VA200Hz
Acer Predator Z271UV27"2560x1440 IPS165Hz
Acer Predator XB27227"1920x1080 TN240Hz
Acer Predator XB272-HDR27"3840x2160 IPS144Hz
ASUS ROG PG248Q24"1920x1080 TN180Hz
ASUS PG27AQ27"3840x2160 IPS60Hz
ASUS PG278QR27"2560x1440 TN165Hz
ASUS VG248QE G-SYNC24"1920x1080 TN144Hz
ASUS PG278Q27"2560x1440 TN144Hz
ASUS PG279Q27"2560x1440 IPS144Hz
ASUS PG27VQ27"2560x1440 TN165Hz
ASUS XG27VQ27"1920x1080144Hz
ASUS PG348Q34"3440x1440 IPS100Hz
ASUS ROG Swift PG27UQ27"3840x2160 IPS144Hz
ASUS ROG SWIFT PG258Q25"1920x1080 TN240Hz
BenQ XL2420G24"1920x1080 TN144Hz
BenQ XL2720G27"1920x1080 TN144Hz
Dell S2716DG27"2560x1440 TN144Hz
Dell S2417DG24"2560x1440 TN165Hz
AOC G2460PG24"1920x1080 TN144Hz
AOC AG241QG24"2560x1440 TN165Hz
AOC AG271QG27"2560x1440 AHVA165Hz
AOC AGON AG352UCG35"3440x1440 VA100Hz
AOC AGON AG271UG27"3840x2160 IPS60Hz
Philips 272G5DYEB27"1920x1080 TN144Hz
ViewSonic VX2457GML24"1920x1080 TN144Hz
ViewSonic XG270327"2560x1440 IPS165Hz
Lenovo Y27g27"1920x1080 VA144Hz
Acer Predator Z35P35"3440x1440 VA120Hz
HP Omen X 3535"3440x1440 VA100Hz

For various purposes, we’ve made a dedicated page to the list of G-SYNC monitors. Feel free to link to our G-SYNC monitor list from anywhere you would like. The list gets updated every week with new additions.

And this is also recommended for you: ViewSonic Xg2530 G Sync

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