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SLI FPS vs Single card FPS - Page 3

post #21 of 53
Quote:
Originally Posted by brettjv View Post
No, you're not the only one. And yes, it's called microstutter. I've probably mentioned on these boards like 10 times that 45fps in SLI can often 'feel' about as smooth as 30fps on a single card. And it will vary from game to game, driver to driver, even day to day, because it's a dynamic situation.

Microstutter is caused by the game falling into a pattern of rendering frames at a rate that is not 'evenly spaced' over time. Drivers attempt to keep this from happening, but the thing is ... the best 'scaling' is achieved with the 'worst' microstutter. So since raw FPS 'sells cards', the driver makers don't always try their hardest to come up with algorithms that will keep the game as smooth as possible because it costs raw fps (because 'smoothness' with multi-GPU requires one card 'waiting' on the other from time to time ... which is *not* optimal for max FPS).

There's more to the perception of smoothness than just FPS, bottom-line. The distribution of frames over time plays a BIG role. And microstutter is a 'bad' frame distribution, that happens to result in 'good' scaling. So we're stuck with it unless and until reviewers come up with a better way of representing the gameplay experience aside from raw FPS, and that becomes the 'new standard' that people buy gear based upon.

I wish that nV would come up with a control panel option for maximizing smoothness. It could be done, but like I say it'll 'cost' in the all important 'scaling' department. And once they put out an option like that, it'll bring to light the whole lie that > FPS is always equal to more 'smoothness' (it's a lie when it comes to multi-GPU at least) and frankly I don't think they'll do it because the reviewers will start using it on their cards when doing reviews, and they'll think it'll cost them market share. People may not BUY that 2nd card when they discover that 'max smoothness' results in like 50% scaling instead of the 'desired' 100% scaling.

And I'm not telling you this cause I'm a SLI hater. I actually like SLI, I run SLI, and I have for the past 2.5 years. But this possibility of occasionally running into games where MS is a problem ... is something that you deal with. It doesn't happen in every game, or even all the time in the same game. Honestly most of the time, the gain in FPS is 'worth it' in my book.
I understand all of your points Brett but honestly MS never seems to happen to me in games. I've noticed it in canned benches like Heaven and Metro 2033, but in actual gameplay everything is smooth as can be. I should post a video of Crysis 2 in action so you can see....
post #22 of 53
Quote:
Originally Posted by Majin SSJ Eric View Post
I understand all of your points Brett but honestly MS never seems to happen to me in games. I've noticed it in canned benches like Heaven and Metro 2033, but in actual gameplay everything is smooth as can be. I should post a video of Crysis 2 in action so you can see....
Generally-speaking, microstutter should only be *noticeable* at lower FPS. If you're humming along at 60 or above, typically that's fast enough that even if the frame distribution is poorly-spaced, you won't perceive the ms is happening. But different people have different sensitivity to it as well.

I've only very rarely noticed it myself, and only when my cards are struggling and dropping down to the 40's or below a lot, and not in every game, nor even every time I play the same game.

I'm just saying that the symptoms the OP is describing is absolutely classic microstutter. The perceived FPS being much lower than the displayed FPS ... that's what ms does, exactly.
    
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post #23 of 53
Some games also just don't like SLI. I remember trying to run Shogun: Total War in SLI, and it was absolutely chugging. It ran like butter with one card after turning SLI off. Making my own profile for it didn't help at all, but maybe it's better with these more recent drivers.

Just remember, if you have performance issues with a specific game, turning SLI off should be your first step in troubleshooting.

If you're just saying that you see a difference between a definite 80 FPS with it on and off, I've never seen it, and I've been using SLI pretty much since its inception. Microstutter is almost nonexistent these days.
Edited by Kaldari - 8/4/11 at 8:23am
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post #24 of 53
Quote:
Originally Posted by brettjv View Post
Generally-speaking, microstutter should only be *noticeable* at lower FPS. If you're humming along at 60 or above, typically that's fast enough that even if the frame distribution is poorly-spaced, you won't perceive the ms is happening. But different people have different sensitivity to it as well.

I've only very rarely noticed it myself, and only when my cards are struggling and dropping down to the 40's or below a lot, and not in every game, nor even every time I play the same game.

I'm just saying that the symptoms the OP is describing is absolutely classic microstutter. The perceived FPS being much lower than the displayed FPS ... that's what ms does, exactly.
Yeah, I never dip below 60fps in any of my games. Usually running around 100+fps...
post #25 of 53
Quote:
Originally Posted by Majin SSJ Eric View Post
Yeah, I never dip below 60fps in any of my games. Usually running around 100+fps...
That means its time for a monitor upgrade!
post #26 of 53
I've only noticed this in metro as well. Very high/1080p/maxxed...still very playable.
     
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post #27 of 53
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Originally Posted by Booty Warrior View Post
That means its time for a monitor upgrade!
Wife banned me from any more computer spending for the rest of the year...
post #28 of 53
Quote:
Originally Posted by Majin SSJ Eric View Post
Wife banned me from any more computer spending for the rest of the year...
Hmm... may need a wife upgrade to clear your money bottleneck.
post #29 of 53
Quote:
Originally Posted by Majin SSJ Eric View Post
Wife banned me from any more computer spending for the rest of the year...

Me too. I'm lucky to have gotten this far. I think the psu and extra 570 pushed the limit!
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post #30 of 53
Quote:
Originally Posted by t-ramp View Post
Not true. Besides, he's saying at 80fps SLI makes the stuttering noticeable, even though the monitor isn't actually displaying 80fps.
This is what makes me think that he having a problem other than microstutter.
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