Post
by Chief Blur Buster » 14 Dec 2018, 13:38
For GSYNC, you keep VSYNC ON with it in Control Panel, but VSYNC OFF in the games themselves -- as many GSYNC FAQ's tell you, including ours.
In addition, RTSS is the most microsecond-accurate lowest-lag external frame rate capping utility.
An in-game framerate capper is better but for ULMB+GSYNC I highly and very strongly recommend RTSS because the microsecond-accuracy of the framerate capping will allow maxed-framerate situations (e.g. 117fps at 120Hz ULMB) to avoid any erratic flickering of the combination of ULMB+GSYNC.
ULMB+GSYNC is an absolute beauty (it becomes a 100% jitteriness-free ULMB mode while giving your framerate room to "breathe") to behold if you can control the erratic flickering and low-framerate dimming.
In Blur Busters philosophy of "The Right Tool For The Right Job" the combination of ULMB+GSYNC works best when you're preferring ULMB anyway and can usually maybe 50%-80% of the time run at maximum framerate, but absolutely hate the jitteriness-feeling of framedrops during ULMB. (ULMB can amplify stutter).
The comfortable framerate range of ULMB+GSYNC is extremely tight, so if you have a super powerful GPU, I recommend combining the 155Hz ULMB hack with the ULMB+GSYNC trick, so you have a comfortable 85Hz-155Hz VRR range. Below 85Hz, the screen flickers too much and dims too much, and above 155Hz ULMB is not available. So the widest comfortable ULMB VRR framerate range tends to be ~85fps-155fps. If you're okay with more flicker, then range can be ~60fps-155fps
You want
(A) Games that usually runs max framerate more than 50% of the time
(B) framerate slowdowns never has any single frametime longer than 1/75sec in any one-second period (except rarely). Even a single disk access will cause a flicker, so install your game on the fastest SSD and/or have excess RAM to cache the whole game in memory (32GB).
(C) Always combine VSYNC ON with GSYNC. (VSYNC OFF in games, GSYNC + VSYNC ON in NVIDIA Control Panel and/or NVInspector)
(D) For lower lag at ULMB 155Hz, cap at ~152fps. For lower lag at ULMB 120Hz, cap at ~117-118fps. Always use RTSS for microsecond-accuracy framerate capping, some in-game framerate cappers have lower lag but are a little more inaccurate and will cause erratic max-framerate flicker effects that RTSS does not give you during ULMB+GSYNC.
Once you've properly tuned ULMB+GSYNC, it's a beauty to behold. It's fiddly, picky, not for the faint of heart, but can be an absolute beauty to have blurless & tearless & stutterless ULMB that's also simultaneously lower lag than regular ULMB.