Rip Gsync (FastSync?)

bishi · 19 May 2016 at 16:48

NirK said:
I have not read much about it...

I am not sure it will be any benefit for people with 144hz monitors, but should be good for people on 60hz monitors / TV's.

It will be be of benefit, because it removes tearing. Tearing with VSYNC OFF is still very noticeable at 144hz its even more noticeable if you use ULMB or other blur reduction. So yes, it is still of benefit.

NirK · 19 May 2016 at 16:52

bishi said:
It will be be of benefit, because it removes tearing. Tearing with VSYNC OFF is still very noticeable at 144hz its even more noticeable if you use ULMB or other blur reduction. So yes, it is still of benefit.

Yeh but if people want absolute minimum lag in games with high FPS, it would still be lower at vsync off 300fps, than fast sync 144hz + it looks like it has a bit more lag than vsync off.. probably of zero benefit to people with gsync, but good if you have 60hz TV or monitor.

bishi · 19 May 2016 at 16:57

BS Dave said:
If this works with nvidia adaptive sync (see above) then that will be awesome

It can't work with adaptive sync since all adaptive sync does is
vsync on < monitor refresh > vsync off
Theoretically if FAST SYNC does function while your framerate is below max then it is still of benefit as at least the render pipeline is decoupled and doesn't need to sync. So it should still be preferable to VSYNC ON

shankly1985 · 19 May 2016 at 17:01

bishi said:
It will be be of benefit, because it removes tearing. Tearing with VSYNC OFF is still very noticeable at 144hz its even more noticeable if you use ULMB or other blur reduction. So yes, it is still of benefit.

Only if you can maintain a solid 144fps so it can fastsync a full frame with each refresh. If you drop down to say 100 or 90fps you will get screen tear, this is where you either use Gsync or Vsync.

bishi · 19 May 2016 at 17:05

NirK said:
Yeh but if people want absolute minimum lag in games with high FPS, it would still be lower at vsync off 300fps, than fast sync 144hz + it looks like it has a bit more lag than vsync off.. probably of zero benefit to people with gsync, but good if you have 60hz TV or monitor.

Yes VSYNC OFF is still the consistently best way to get the lowest input lag but you WILL get tearing.
G-SYNC does not function when your framerate is at or over max, then it will depend on how you have v-sync set
G-SYNC (low input lag, no tearing) < REFRESH RATE > V-SYNC ON (input lag, no tearing)
OR
G-SYNC (low input lag, no tearing) < REFRESH RATE > V-SYNC OFF (almost no input lag, tearing)

The new option is

G-SYNC (low input lag, no tearing) < REFRESH RATE > FAST SYNC ON (very low input lag, NO tearing)

BS Dave · 19 May 2016 at 17:49

bishi said:
It can't work with adaptive sync since all adaptive sync does is
vsync on < monitor refresh > vsync off
Theoretically if FAST SYNC does function while your framerate is below max then it is still of benefit as at least the render pipeline is decoupled and doesn't need to sync. So it should still be preferable to VSYNC ON

What i mean is fast sync <Monitor Refresh> V Sync off

BS Dave · 19 May 2016 at 17:52

bishi said:
Yes VSYNC OFF is still the consistently best way to get the lowest input lag but you WILL get tearing.
G-SYNC does not function when your framerate is at or over max, then it will depend on how you have v-sync set
G-SYNC (low input lag, no tearing) < REFRESH RATE > V-SYNC ON (input lag, no tearing)
OR
G-SYNC (low input lag, no tearing) < REFRESH RATE > V-SYNC OFF (almost no input lag, tearing)

The new option is

G-SYNC (low input lag, no tearing) < REFRESH RATE > FAST SYNC ON (very low input lag, NO tearing)

Surely fast sync is only an option above monitor refresh rate?? Below monitor refresh on g-sync it guesses at the frametime and uses a quick repeat frame, then within g-sync range next frame

BS Dave · 19 May 2016 at 18:04

OK just watched the video - Nvidia have renamed triple buffering

http://www.anandtech.com/show/2794

imginy · 19 May 2016 at 18:23

Fast sync would be great for me as I mainly play 2d fighting games which run at a constant 60fps and even when I play other games I always make sure they never drop below 60fps because vsync stutters.

Just lately I have really been noticing the amount of lag vsync adds and how it is effecting me, games feel so much more enjoyable to play without the input lag but I cant stand the tearing. I tried varius things to reduce the lag of vsync like limiting frames and windowed mode but didn't help much.

I had come to the conclusion that I would have to put up with the lag or get a gsync/free sync monitor which I didnt really want.

Hopefully it works as advertised

stooeh · 19 May 2016 at 18:23

BS Dave said:
Surely fast sync is only an option above monitor refresh rate?? Below monitor refresh on g-sync it guesses at the frametime and uses a quick repeat frame, then within g-sync range next frame

Probably means G-SYNC (low input lag, no tearing) < REFRESH RATE < FAST SYNC ON (very low input lag, NO tearing)

Five.Stars · 19 May 2016 at 18:29

So I am wondering what will happen when the fps drops below the monitor/ tv's refresh rate? Tearing? If it is triple buffered vsync under refresh rate and fast-sync above refresh rate, then that sounds very attractive.

bishi · 19 May 2016 at 22:34

BS Dave said:
OK just watched the video - Nvidia have renamed triple buffering

http://www.anandtech.com/show/2794

Whilst similar to triple buffering, it isn't quite the same. It doesn't block the render pipeline so its still better.

bishi · 19 May 2016 at 22:35

Five.Stars said:
So I am wondering what will happen when the fps drops below the monitor/ tv's refresh rate? Tearing? If it is triple buffered vsync under refresh rate and fast-sync above refresh rate, then that sounds very attractive.

I'm guessing (might be wrong) that it still has a purpose in that it still offers completely drawn frames so there is no reason to show partly drawn (teared) frames.

NirK · 19 May 2016 at 22:41

bishi said:
Yes VSYNC OFF is still the consistently best way to get the lowest input lag but you WILL get tearing.
G-SYNC does not function when your framerate is at or over max, then it will depend on how you have v-sync set
G-SYNC (low input lag, no tearing) < REFRESH RATE > V-SYNC ON (input lag, no tearing)
OR
G-SYNC (low input lag, no tearing) < REFRESH RATE > V-SYNC OFF (almost no input lag, tearing)

The new option is

G-SYNC (low input lag, no tearing) < REFRESH RATE > FAST SYNC ON (very low input lag, NO tearing)

Good plan, no need for limiting framerate then.

bishi · 19 May 2016 at 22:42

NirK said:
Good plan, no need for limiting framerate then.

Yeah, limiting framerate can work in some situations but unfortunately has its own issues like introducing microstutter.

NirK · 19 May 2016 at 23:01

bishi said:
Yeah, limiting framerate can work in some situations but unfortunately has its own issues like introducing microstutter.

I meant with Gsync, I have not noticed that when limiting to 98fps on 100hz monitor. But yes if this works so you can have 30-99fps Gsync and then 100fps fast sync, that will be good.

Dicehunter · 19 May 2016 at 23:22

bishi said:
GSYNC ceases to function at 60FPS (monitor cap) and VSYNC functionality kicks in IF enabled (which it is by default, there is an option in NVCP). You can just turn this off so once you exceed your refresh rate it runs VSYNC off.
If you turn FASTSYNC on then its like VSYNC off so you can exceed your refresh rate and then you will get the VSYNC benefits (no tearing) but without the associated input lag.
GSYNC users have tried to get around this problem previously by capping their framerate below their monitor refresh rate but this has its own problems.

To be clear, G-SYNC is STILL preferable to no G-SYNC if you get low frame rates (below refresh rate) but as we already know, G-SYNC is useless if you are always at maximum refresh rate, and this is where FASTSYNC comes in. Hence why some may find that they are useful together.

This right here.

Having G-Sync is still preferable if you are under your monitors refresh rate ceiling.

Safetytrousers · 19 May 2016 at 23:29

Dicehunter said:
Fast Sync only really benefits everyone if they go above their monitors refresh rate which in todays games unless you turn everything down or play at a low res isn't happening all that much

I've only played GTAV and Hitman since I've had my x34 and Hitman is frame capped so that doesn't count here. In GTAV the frame rate hits the maximum your monitor goes to while in a menu or the map. If I don't enable v-sync then while in a map or the menu movement is extremely jerky and those screens are almost unusable. Enabling v-sync means they work as they should.
So hitting the monitor refresh rate in GTAV is inevitable and frequent.

geordiejc · 20 May 2016 at 00:03

bishi said:
GSYNC ceases to function at 60FPS (monitor cap) and VSYNC functionality kicks in IF enabled (which it is by default, there is an option in NVCP). You can just turn this off so once you exceed your refresh rate it runs VSYNC off.
If you turn FASTSYNC on then its like VSYNC off so you can exceed your refresh rate and then you will get the VSYNC benefits (no tearing) but without the associated input lag.
GSYNC users have tried to get around this problem previously by capping their framerate below their monitor refresh rate but this has its own problems.

To be clear, G-SYNC is STILL preferable to no G-SYNC if you get low frame rates (below refresh rate) but as we already know, G-SYNC is useless if you are always at maximum refresh rate, and this is where FASTSYNC comes in. Hence why some may find that they are useful together.

So should i set this to vsync off? - i use gsync.

Safetytrousers · 20 May 2016 at 00:10

geordiejc said:
So should i set this to vsync off? - i use gsync.

Turn it off and see if it adversely affects your game. If it does then turn then it back on. If it doesn't then you are better off for not having to run another process.