Triple buffering option in OpenGL compatability

[Art]

In general, is it best to have this enabled or disabled?

 

[Little TeaPot]

I just tried it and on and i can't even finish the timedemo anymore ?


I tried it with Vsync on and off ?

Ive heard with it on you get 5 to 10 fps more, if you have vsync on if
it works that is.

 

[The Berzerker]

In general, is it best to have this enabled or disabled?

Well.... I get 41fps in the timedemo without v-sync, and with triple
buffering disabled.

The framte rate is reduced to 30 with v-sync enabled...... so off I go to
try this triple buffer thing...

timedemo now reports 40.1fps with vy-sync on (and of course the triple
buffer)


So, sounds good to me!

 

[Mas G]

I can't see what the asnwer was about the buffering? Enabled or disabled?
and where do you set it?

 

[The Berzerker]

Display>Settings>Advanced>3D>OpenGL>Compatibility

I don't really know what it does but it let me get near enough the same
frame rate with v-sync on as off. Does anyone know the disadvantages of
this? There must be some negative ffect...

 

[Glzmo]

Display>Settings>Advanced>3D>OpenGL>Compatibility

I don't really know what it does but it let me get near enough the same
frame rate with v-sync on as off. Does anyone know the disadvantages of
this? There must be some negative ffect...

AFAIK it uses up more memory.

 

[The Berzerker]

AFAIK it uses up more memory.

We talking the system's RAM, or memory on the video card?

Either way, glad it's a legit performance boost, if you get me, rather than
making something shit to improve fps etc. I hope it's the system's RAM, I've
got enough to spare.

 

[Tony DiMarzio]

It uses more Frame Buffer memory (however it is a static increase, meaning
regardless of the application, triple buffering will always use the same
amount of additional RAM). So... YES, we are talking about RAM on the vid
card.

 

[Little TeaPot]

Well it smooths the timedemo down make sit less jerky or they could be
the Vsync on ?

 

[First of One]

Triple-buffering uses 50% more framebuffer memory on the video card. It
allows you to disable vsync yet not get the tearing.

On a lot of modern games triple-buffering can slow the game down
considerably because the textures get pushed into system memory through AGP,
which is dog-slow compared to video memory. This happens more often if you
have FSAA enabled and less often if your card has a lot of memory (say 256
MB).

I remember trying this option on my 16 MB Voodoo3 with 3DMark 2000. With
triple-buffering, I got a slightly higher score, because the score is
calculated only from the game tests, which used small textures. The 64-MB
texture "tunnel" test, however, slowed down by 80% with it enabled.

 

[REX]

Triple-buffering uses 50% more framebuffer memory on the video card. It
allows you to disable vsync yet not get the tearing.

On a lot of modern games triple-buffering can slow the game down
considerably because the textures get pushed into system memory through AGP,
which is dog-slow compared to video memory. This happens more often if you
have FSAA enabled and less often if your card has a lot of memory (say 256
MB).

Has anyone found any specific examples of games that have problems when
triple buffering is enabled?

 

[dave]

Triple-buffering uses 50% more framebuffer memory on the video card. It
allows you to disable vsync yet not get the tearing.

On a lot of modern games triple-buffering can slow the game down
considerably because the textures get pushed into system memory through AGP,
which is dog-slow compared to video memory. This happens more often if you
have FSAA enabled and less often if your card has a lot of memory (say 256
MB).

So in this case (textures pushed into system memory) PCI-E (16*)
would produce a benefit ?
ie. if you use full AA, with Vsync and triple-buffer ?

 

[First of One]

"Have problems" as utterly refusing to run to quitting randomly?
Triple-buffering may require a larger AGP aperture setting. Otherwise it
should just run slowly, but still run.

 

[First of One]

You see only a small improvement with PCIe, theoretically. AGP8x transfers
at 4.2 GB/s. Dual-channel DDR400 is capable of 6.4 GB/s. So a 16-lane PCIe
bus will give you approx. 50% more bandwidth.

This is all just peanuts compared to the 35 GB/s offered by a Geforce
6800U's onboard memory, though. So if textures do get pushed into system
memory, the game will be ass-slow no matter what kind of interface you got.