Rip Gsync (FastSync?)

[Dicehunter]

whilst I don't necessarily disagree, as options are always good for the consumer, at least fast sync works without needing to change monitor at all, so it benefits everyone

it is complimentary to gsync, and replaces vsync with something better

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

G-Sync on the other hand can benefit everyone as it goes from 1-144Hz depending on your monitors refresh rate.

 

[tommybhoy]

whilst I don't necessarily disagree, as options are always good for the consumer, at least fast sync works without needing to change monitor at all, so it benefits everyone

it is complimentary to gsync, and replaces vsync with something better

Fair play andy.

G-Sync on the other hand can benefit everyone as it goes from 1-144Hz depending on your monitors refresh rate.

Didn't think you'd fall for the spin mate drops to 30fps is bad enough running under G-Sync never mind down to 1 fps.

 

[Dicehunter]

Fair play andy.



Didn't think you'd fall for the spin mate drops to 30fps is bad enough running under G-Sync never mind down to 1 fps.

Didn't fall for any spin I just watched the PCPER video on G-Sync were they measured using various bits of tech, Not saying I'd ever play sub 30FPS but it does work at sub 30FPS

Pretty cool how you can have G-Sync on for your monitors refresh rate and Fast Sync for above it, Cool times ahead

 

[tommybhoy]

Didn't fall for any spin I just watched the PCPER video on G-Sync were they measured using various bits of tech, Not saying I'd ever play sub 30FPS but it does work at sub 30FPS

Technically it's doable, but shudder the thought someone splurges out cash thinking G-sync works wonders under 30fps.

 

[bishi]

Explanation of terms for those that are unsure:

V-SYNC - Framerate synced with monitor refresh rate (no tearing, input lag, increasing input lag as framerate lowers since)

V-SYNC OFF - Framerate un-synced (tearing, very little input lag)

Adaptive Sync - At high framerates, VSync is enabled to eliminate tearing. At low frame rates, it's disabled to minimise stuttering. (input lag at high frame rates, tearing at low frame rates)

G-SYNC / FreeSync - Syncs refresh rate to frame rate (no tearing, minor input lag)
(important to note that if maximum refresh rate is hit, G-SYNC will no longer be functioning so then input lag may be encountered if V-SYNC is enabled, input lag will not be encountered if V-SYNC is disabled but tearing will be)

FAST-SYNC - De-coupled rendering and monitor refresh. VSYNC OFF but the monitor will only render completely rendered frames, thus eliminating tearing (MINOR input lag but NO TEARING! ) also it is monitor agnostic so it will work with any screen. It is analogous to hardware triple buffering but does not back-pressure the render pipeline.

It is a clever solution to the problem and requires very little overhead there should be no performance hit. It can still be used with G-SYNC for those that have systems that struggle to maintain FPS > refresh rate.

Personally, I'm super sensitive to tearing and I'm excited as it finally means I can play with V-SYNC off!

 

[LoadsaMoney]

FastSync...

 

[fantasticCG]

so you use gsync and fast sync together one for monitor and one for mouse??

 

[Things change I've changed]

so you use gsync and fast sync together one for monitor and one for mouse??

Yep.

I'm personally not desperate for fast sync because I like using adaptive sync as it saves wasted frames and lowers my GPU temps/noise, I can't really say I've noticed a ton of mouse lag

 

[shankly1985]

So fastsync will lock to the monitor refresh rate but only display one fully rendered frame. So 60hz will lock @60fps without vsync and will complete a full frame displayed?

It sounds like a cool idea, but what I don't understand if this is best used for when you going over monitor refresh rate you get no input lag screen tear etc but isn't vsync the same? I mean the only downside to vsync is when the frame rate drops you get stutter and input lag, what happens when your frame rate drops below on fastsync? I guessing screen tear unless you enable vsync or better Gsync.

 

[thefogo]

This is pretty nice as the reduced latency is the main reason I would buy a g-sync monitor

 

[BS Dave]

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

 

[Asa]

Sounds like NVidia could be my best option for the PC that is connected to my 4k60 TV, where adaptive sync is not available.

Are they keeping v-sync as an option, or does fastsync completely replace it?

 

[shankly1985]

Sounds like NVidia could be my best option for the PC that is connected to my 4k60 TV, where adaptive sync is not available.

Are they keeping v-sync as an option, or does fastsync completely replace it?

Doesn't replace it. From my understand it only helps if you can keep Frame rate at or above refresh rate. You drop below and you get screen tear.

 

[NirK]

I agree with some of what you say. I play cs:go at 60fps/hz gsync. with fast sync you can get 240fps in 4k WITHOUT screen tearing which is essentially what gsync does.

Gsync solved the problem of screen tearing with vsync off and input lag with vsync on. In summary i think the only difference is fast sync wont limit your FPS but will give the same result as gsync.

Well no because you can only see 60fps as the monitor is 60hz... but yes you will get the reduced input lag of the game running at 240fps and no tearing.

On a Gsync monitor you can see 100 or 144 fps as the monitor refresh rate will go that high. You will still only see 60 frames per second.

Basically as long as you get over the refresh rate of the monitor at all times, you are getting normal Vsync, but with less lag. But not the same as Gsync at all.

I am not sure what happens when it goes under the monitor refresh rate... if it will get tearing or triple buffer stuttering.

 

[BS Dave]

I am not sure what happens when it goes under the monitor refresh rate... if it will get tearing or triple buffer stuttering.

it would be amazballs if there was the option to choose

 

[NirK]

it would be amazballs if there was the option to choose

Or just get Gsync

 

[shankly1985]

Well no because you can only see 60fps as the monitor is 60hz... but yes you will get the reduced input lag of the game running at 240fps and no tearing.

On a Gsync monitor you can see 100 or 144 fps as the monitor refresh rate will go that high. You will still only see 60 frames per second.

Basically as long as you get over the refresh rate of the monitor at all times, you are getting normal Vsync, but with less lag. But not the same as Gsync at all.

I am not sure what happens when it goes under the monitor refresh rate... if it will get tearing or triple buffer stuttering.

I don't believe this works how you saying. Frame rate won't be over the refresh rate so 60hz will be 60fps and with each refresh cycle fastsync will insert a full frame removing tearing.

It's not possible to have 240fps with a refresh rate of 60hz and get no screen tear.

You guys are missing the point.

 

[NirK]

I don't believe this works how you saying. Frame rate won't be over the refresh rate so 60hz will be 60fps and with each refresh cycle fastsync will insert a full frame removing tearing.

It's not possible to have 240fps with a refresh rate of 60hz and get no screen tear.

You guys are missing the point.

I have not read much about it...

But basically it is Vsync with less lag.

But then people might still run CS:GO at 300fps with Vsync off, because 300fps has less lag than 60fps.

But 300fps is 3.3ms lag and 60fps is 16.7ms lag... without any Vsync. So might be that vsync off is still the best option for people playing CS:GO etc.

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.

 

[geordiejc]

I'm pretty confused so let's all work through an example and see if we can get to the bottom of this (even if its just for my benefit!)

Problem:

If i enable Gsync, my GPU + Monitor are in sync and the GPU renders 60FPS MAX - it doesnt render anything above - so how can fastsync and gsync work together when gsync won't let the GPU render > 60fps.

 

[bishi]

I'm pretty confused so let's all work through an example and see if we can get to the bottom of this (even if its just for my benefit!)

Problem:

If i enable Gsync, my GPU + Monitor are in sync and the GPU renders 60FPS MAX - it doesnt render anything above - so how can fastsync and gsync work together when gsync won't let the GPU render > 60fps.

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.