Forcing refresh doubling (LFC) for 60 fps content with a 144hz display?

Talk about AMD's FreeSync and VESA AdaptiveSync, which are variable refresh rate technologies. They also eliminate stutters, and eliminate tearing. List of FreeSync Monitors.
Post Reply
someguy
Posts: 3
Joined: 20 Dec 2020, 13:56

Forcing refresh doubling (LFC) for 60 fps content with a 144hz display?

Post by someguy » 15 Jan 2021, 12:43

Is it possible to force 60 fps content refresh doubling (LFC) with a 144hz display, or would you need something slightly wider such as 165hz? Assuming a Nvidia GPU.

Using CRU to artificially bump up the VRR range lower end to 60hz (or would you need 61hz?). Applying frame rate limiter (in game or RTSS) at 60 fps (or would you need 61 fps?).

The reason for this would be whether or not it works as an adhoc work around for displays with more overshoot at 60hz vs. 120hz.

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

Re: Forcing refresh doubling (LFC) for 60 fps content with a 144hz display?

Post by Chief Blur Buster » 28 Jan 2021, 03:08

someguy wrote:
15 Jan 2021, 12:43
Is it possible to force 60 fps content refresh doubling (LFC) with a 144hz display, or would you need something slightly wider such as 165hz? Assuming a Nvidia GPU.

Using CRU to artificially bump up the VRR range lower end to 60hz (or would you need 61hz?). Applying frame rate limiter (in game or RTSS) at 60 fps (or would you need 61 fps?).

The reason for this would be whether or not it works as an adhoc work around for displays with more overshoot at 60hz vs. 120hz.
Ideally you need a min Hz at least 2.4x the max Hz. There's not much room to raise LFC min Hz on a 144 Hz FreeSync display. Ideally you want a 240Hz+ panel to get very good quality 65Hz LFC.

If you had a 240Hz VRR panel, this is what can work:
1. Raise FreeSync min Hz to 65 Hz
2. Your 60fps content will be LFC-framerate doubled to 120Hz. Consistent framepaced 60fps will have no LFC stutter artifacts, and can have better looking overdrive / less GtG flicker / less inversion artifacts.

A higher LFC min-Hz is sometimes picture-quality advantageous on 240Hz+ monitors, but you have to be judicious about it.

For 144Hz FreeSync panels, I do not recommend raising LFC too much, since LFC fails/stutters way more with a tight VRR range.
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