Screen tearing at 240fps @190hz with dyac+ enabled

Adjusting BENQ Blur Reduction and DyAc (Dynamic Acceleration) including Blur Busters Strobe Utility. Supports most BenQ/Zowie Z-Series monitors (XL2411, XL2420, XL2720, XL2735, XL2540, XL2546)
Post Reply
kPhobos
Posts: 19
Joined: 04 May 2022, 14:48

Screen tearing at 240fps @190hz with dyac+ enabled

Post by kPhobos » 26 May 2022, 11:55

Im using large VT 1508,

Wanted to sublimt a video, but Forums dont support .mov, uploaded it as a YouTube short, so you Can see for yourself.


Fps is constant 240, in aimlabs (wanted to use this for example due to simplicity of textures and visual clearity)

https://youtube.com/short/7IuiqEDLg4s

I’ve Been messing around with CRU for a bit, but cant Seem to find a good standpoint, i want the highest refresh rate, but also the most efficient dyac+ settings, so figured 190hz would give enough headroom for my large VT to get ris of tearing and artifacts, but i just cant Seem to find the Sweet spot

Monitor is benq XL2546

Any suggestions appreciated!

User avatar
Chief Blur Buster
Site Admin
Posts: 11647
Joined: 05 Dec 2013, 15:44
Location: Toronto / Hamilton, Ontario, Canada
Contact:

Re: Screen tearing at 240fps @190hz with dyac+ enabled

Post by Chief Blur Buster » 27 May 2022, 18:47

I've never said that QFT eliminates tearing unless you're using RTSS Scanline Sync

Are you using RTSS Scanline Sync for the tearingless VSYNC OFF techniques?

QFT does make it easier to hide tearing with RTSS Scanline Sync, because of a bigger VBI for VSYNC OFF tearlines to jitter inside unseen offscreen, at framerate=Hz. If so, please post your Scanline Sync settings and I can help you.

If not, remember your GPU load needs to be roughly ~50% or less at 190fps for tearingless VSYNC OFF to work reliably. If your goal is eliminating tearing at the lowest lag possible, you may have to adjust your refresh rate down (while increasing the QFT factor to maintain the low latency of lower refresh rates) -- until GPU load falls enough to allow reliable scanline sync.

Image

In this use case, the bigger the Vertical Total, the more room in the VBI to hide tearline jitter using scanline-based frame rate capping techniques. RTSS Scanline Sync steers to raster-precise VSYNC OFF in the blanking interval between refresh cycles, moving the tearlines off the top edge of the screen.

The bigger the Vertical Total (bigger VBI), the more room for erratic timings to still keep jittering tearlines hidden in the VBI. But it must be done simultaneously with extra software such as RTSS Scanline Sync or Special-K Latent Sync, both of which are raster-methods of steering VSYNC OFF tearlines to a precise position (such as offscreen).
Head of Blur Busters - BlurBusters.com | TestUFO.com | Follow @BlurBusters on Twitter

Image
Forum Rules wrote:  1. Rule #1: Be Nice. This is published forum rule #1. Even To Newbies & People You Disagree With!
  2. Please report rule violations If you see a post that violates forum rules, then report the post.
  3. ALWAYS respect indie testers here. See how indies are bootstrapping Blur Busters research!

Post Reply