SLi and Vsynch

[chizow]

Originally posted by: lavaheadache
Vsync and triple buffering works for me... However sometimes Sli seems a little jittery to me. Even though I have high frame rates it doesn't always seem smooth like youd expect

You might want to check this out: Micro-Stuttering @ PCGH on Multi-GPU configs

They observed the micro-stuttering on both CF and SLI solutions. Apparently its something more and more people are catching onto with multi-GPU performance. That even though you get higher FPS, the gameplay actually looks choppier than with a single GPU at lower FPS. Things like this along with iffy SLI overclocking in Vista and no multi-monitor SLI support have me waiting for the next 9-series single GPU solution.

 

[CP5670]

Originally posted by: chizow

Originally posted by: lavaheadache
Vsync and triple buffering works for me... However sometimes Sli seems a little jittery to me. Even though I have high frame rates it doesn't always seem smooth like youd expect

You might want to check this out: Micro-Stuttering @ PCGH on Multi-GPU configs

They observed the micro-stuttering on both CF and SLI solutions. Apparently its something more and more people are catching onto with multi-GPU performance. That even though you get higher FPS, the gameplay actually looks choppier than with a single GPU at lower FPS. Things like this along with iffy SLI overclocking in Vista and no multi-monitor SLI support have me waiting for the next 9-series single GPU solution.

It's interesting that this effect has been observed by other people too. I noticed it in a number of games myself, particularly Splinter Cell: Chaos Theory. The hardware sites had all showed nearly double the performance in this game, and indeed, FRAPS was showing around 55fps instead of 30 on a single card, but despite that, things subjectively "felt" smoother to me in single card mode.

As I mentioned earlier though, I have a feeling that it is somehow related to the broken vsync, as I only noticed it when vsync wasn't working properly. It may be that multi-GPU setups show additional artifacts from the lack of vsync, as the tearing in general looked a lot worse than anything I've seen on a single card.

 

[apoppin]

Originally posted by: apoppin

Originally posted by: nRollo

Originally posted by: apoppin
i run across some interesting things from time-to-time

perhaps you guys ... and especially [nv]Rollo might care to look at this - are you UNaware of "new" SLi rendering modes that have been *recently added*?
-i thought you got your info directly from nvidia

i believe that AFR3 - has been in the drivers for a little while now ... why don't you guys open up "nHancer" and take a look for yourselves

hint ... it's under "new AFR" ... and it sure looks like SLi:AFR3
:roll:

I think AFR3 is three way AFR Apoppin. When I open up CP it says "3 way AFR" now.

You are pretty clueless ... in the interest of 'accuracy', had to ask for a little help last night:

http://img134.imageshack.us/im.../9730/afrmodes1qq2.jpg

http://img409.imageshack.us/im.../9361/afrmodes2qa7.jpg

AFR3 IS 3-way SLi related but you can use it if you only have two cards. Some profiles are set to use it by default - Oblivion being an example (see link below). The profile says 'disabled' as it is a predefined profile you have to duplicate before you can alter any settings in it.


http://img221.imageshack.us/im...90/oblivionafr3lu0.jpg

Jeeze ..

Wow ... it looks like i hurt your feelings with my statement
:Q

i did not think you so sensitive ... it appears you can dish it out but not take what you get in return
--You *dismissed* my post as though i was an idiot ... and i thought - at that moment when i replied - that you got a reply that you deserved ..


You are right, however - it was *wrong* of me to just make that statement without qualifying it ... you are not clueless ...
- and whether it is accepted or not, i apologize for it

 

[BFG10K]

Maybe that's why triple-buffering appears to be working for nRollo w/ 3-way SLI? With three cards, there would be three buffers by default with AFR. The driver could, in theory, just use the most up-to-date buffer.

This is a very good point and maybe that's why he's having more success than someone with regular or quad SLI.

They observed the micro-stuttering on both CF and SLI solutions. Apparently its something more and more people are catching onto with multi-GPU performance. That even though you get higher FPS, the gameplay actually looks choppier than with a single GPU at lower FPS.

Yep.

Also another problem inherent to AFR is increased input lag because the GPUs must render ahead to get a performance gain. This buffering causes a delay between the user making input and when it?s seen. With Quad SLI rendering three or four frames ahead the lag must be atrocious.

These and other reasons are why I'm opposed to SLI/Crossfire in general. You pay top dollar and in most cases get an inferior experience in every situation except maybe the framerate counter, something that becomes meaningless if you can?t enjoy your games.

My only interest in the scheme is Super/SLI AA but neither vendor seems to be pursuing or promoting that option this generation. It's a damn shame because two boards can give 4xMSAA at the same hit as one board doing 2xMSAA plus you get 2xRGSS for free which is priceless because super-sampling is extremely expensive on a single card.

Another benefit of these AA modes is that multi-GPU issues such as the ones previously mentioned become a non-issue.

 

[nRollo]

Originally posted by: chizow

Originally posted by: lavaheadache
Vsync and triple buffering works for me... However sometimes Sli seems a little jittery to me. Even though I have high frame rates it doesn't always seem smooth like youd expect

You might want to check this out: Micro-Stuttering @ PCGH on Multi-GPU configs

They observed the micro-stuttering on both CF and SLI solutions. Apparently its something more and more people are catching onto with multi-GPU performance. That even though you get higher FPS, the gameplay actually looks choppier than with a single GPU at lower FPS. Things like this along with iffy SLI overclocking in Vista and no multi-monitor SLI support have me waiting for the next 9-series single GPU solution.

Hmm. Can't comment on micro stutter, but in general games feel smooth and fast to me with 3 way SLi.

There are pros and cons to multi GPU sets, but for me the pros have outweighed the cons since Voodoo2 days.

 

[lavaheadache]

Originally posted by: nRollo

Originally posted by: chizow

Originally posted by: lavaheadache
Vsync and triple buffering works for me... However sometimes Sli seems a little jittery to me. Even though I have high frame rates it doesn't always seem smooth like youd expect

You might want to check this out: Micro-Stuttering @ PCGH on Multi-GPU configs

They observed the micro-stuttering on both CF and SLI solutions. Apparently its something more and more people are catching onto with multi-GPU performance. That even though you get higher FPS, the gameplay actually looks choppier than with a single GPU at lower FPS. Things like this along with iffy SLI overclocking in Vista and no multi-monitor SLI support have me waiting for the next 9-series single GPU solution.

Hmm. Can't comment on micro stutter, but in general games feel smooth and fast to me with 3 way SLi.

There are pros and cons to multi GPU sets, but for me the pros have outweighed the cons since Voodoo2 days.

Can't comment cause you don't see it or can't comment cause it doesn't bother you?