If you remember back to January of this year, Allyn and posted an article that confirmed the existence of a mobile variant of G-Sync thanks to a leaked driver and an ASUS G751 notebook. Rumors and speculation floated around the Internet ether for a few days but we eventually got official word from NVIDIA that G-Sync for notebooks was a real thing and that it would launch "soon." Well we have that day here finally with the beginning of Computex.
G-Sync for notebooks has no clever branding, no "G-Sync Mobile" or anything like that, so discussing it will be a bit more difficult since the technologies are different. Going forward NVIDIA claims that any gaming notebook using NVIDIA GeForce GPUs will be a G-Sync notebook and will support all of the goodness that variable refresh rate gaming provides. This is fantastic news as notebook gaming is often at lower frame rates than you would find on a desktop PC because of lower powered hardware yet comparable (1080p, 1440p) resolution displays.
Of course, as we discovered in our first look at G-Sync for notebooks back in January, the much debated G-Sync module is not required and will not be present on notebooks featuring the variable refresh technology. So what gives? We went over some of this before, but it deserves to be detailed again.
NVIDIA uses the diagram above to demonstrate the complication of the previous headaches presented by the monitor and GPU communication path before G-Sync was released. You had three different components: the GPU, the monitor scalar and the monitor panel that all needed to work together if VRR was going to become a high quality addition to the game ecosystem.
NVIDIA's answer was to take over all aspects of the pathway for pixels from the GPU to the eyeball, creating the G-Sync module and helping OEMs to hand pick the best panels that would work with VRR technology. This helped NVIDIA make sure it could do things to improve the user experience such as implementing an algorithmic low-frame-rate, frame-doubling capability to maintain smooth and tear-free gaming at frame rates under the panels physical limitations. It also allows them to tune the G-Sync module to the specific panel to help with ghosting and implemention variable overdrive logic.
All of this is required because of the incredible amount of variability in the monitor and panel markets today.
But with notebooks, NVIDIA argues, there is no variability at all to deal with. The notebook OEM gets to handpick the panel and the GPU directly interfaces with the screen instead of passing through a scalar chip. (Note that some desktop monitors like the ever popular Dell 3007WFP did this as well.) There is no other piece of logic in the way attempting to enforce a fixed refresh rate. Because of that direct connection, the GPU is able to control the data passing between it and the display without any other logic working in the middle. This makes implementing VRR technology much more simple and helps with quality control because NVIDIA can validate the panels with the OEMs.
As I mentioned above, going forward, all new notebooks using GTX graphics will be G-Sync notebooks and that should solidify NVIDIA's dominance in the mobile gaming market. NVIDIA will be picking the panels, and tuning the driver for them specifically, to implement anti-ghosting technology (like what exists on the G-Sync module today) and low frame rate doubling. NVIDIA also claims that the world's first 75 Hz notebook panels will ship with GeForce GTX and will be G-Sync enabled this summer – something I am definitely looking forward to trying out myself.
Though it wasn't mentioned, I am hopeful that NVIDIA will continue to allow users the ability to disable V-Sync at frame rates above the maximum refresh of these notebook panels. With most of them limited to 60 Hz (but this applies to 75 Hz as well) the most demanding gamers are going to want that same promise of minimal latency.
At Computex we'll see a handful of models announced with G-Sync up and running. It should be no surprise of course to see the ASUS G751 with the GeForce GTX 980M GPU on this list as it was the model we used in our leaked driver testing back in January. MSI will also launch the GT72 G with a 1080p G-Sync ready display and GTX 980M/970M GPU option. Gigabyte will have a pair of notebooks: the Aorus X7 Pro-SYNC with GTX 970M SLI and a 1080p screen as well as the Aorus X5 with a pair of GTX 965M in SLI and a 3K resolution (2560×1440) screen.
This move is great for gamers and I am eager to see what the resulting experience is for users that pick up these machines. I have long been known as a proponent of variable refresh displays and getting access to that technology on your notebook is a victory for NVIDIA's team.