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brettjv's Microstutter General Information Thread - Page 4

post #31 of 37
Quote:
Originally Posted by brettjv View Post
Hence I believe really phenomenal scaling is a sign of the driver making no effort to space the frames out evenly.
Sounds about right - it is why, I suspect, both AMD and nVidia manage to pull such huge performance gains seemingly nowhere at times... they relax the strictness of the "frame-sync-timer".

Actually, that is something else thats interesting...

With driver 258.96, which has no SLI support for Civilization V, I see lower framerates than with 260...er, I forget the decimals... that has Civ V SLI support... and yet it feels 'smoother' with 258.96.

edit: Why is this thread tagged 4870x2?
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post #32 of 37
If you use RadeonPro on amd crossfire you can change how games use crossfire theirs a couple differt ways it can render it. And funny enugh iv never seen any problems with my 5970+5870.
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post #33 of 37
Quote:
Originally Posted by brettjv View Post
Hence I believe really phenomenal scaling is a sign of the driver making no effort to space the frames out evenly.
I'd be interested to see if you still think their current XFire enhancements are causing the micro-stutter to be so bad.

As long as minimum frames never go below 60, you usually can't notice the stuttering very much.(see frame times above 20ms)

Here's an article that explains what you're talking about. Ignore the Nvidia charts as you'll see at the end of the article that we can't measure frame times with Nvidia until they release the API for 3rd party apps since they have a frame metering device that interferes with frame times.

Quote:
Originally Posted by brettjv View Post
Probably because 4870's were out back in the days when ATI drivers were actually attempting to distribute the frametimes evenly

Some folks may remember that there was a time, actually a little over 1 year ago, when ATI put out a crossfire enhancement package in between driver sets (and it was incorporated into the next driver package), that like magically improved crossfire scaling by like 10-15% overnight. This was before 6xxx-series, at the time, we were still rocking 5850/5870's.

I've been suspicious ever since that time that the way they accomplished this was by re-coding the drivers to abandon attempting to evenly space the output of frames over time on multi-gpu setups ... and I've mentioned it a number of times on OCN.

I believe that they calculated that, since reviewers don't review microstutter, they only review FPS, that they'd sell more multi-gpu setups by throwing caution to the wind and letting the cards fall into whatever pattern of outputting frames that 'came natural'.

Which means, basically, one card never WAITS for the other

I'd be interested to see if you still think their current XFire enhancements are causing the micro-stutter to be so bad.

As long as minimum frames never go below 60, you usually can't notice the stuttering very much.(see frame times above 20ms)

Here's an article that explains what you're talking about. Ignore the Nvidia charts as you'll see at the end of the article that we can't measure frame times with Nvidia until they release the API for 3rd party apps since they have a frame metering device that interferes with frame times.




http://techreport.com/articles.x/21516
Edited by PoopaScoopa - 9/11/11 at 9:32am
post #34 of 37
I know this thread is old, but I did some testing today with SLI 280's and Just cause 2 as I plan my next upgrade, debating between SLI 580 and a new 680, but wanted to play with SLI some more before I made up my mind.
Here are some interesting graphs. These show the exact same 30 seconds of game sequence, one with SLI enabled and the other with out. The graph is the time inbetween frames. You are seeing the very first few seconds of all the data I have recorded. I plan to do some additional testing with Tri SLI 280s and a couple 480s I have as well.

The red line is the average latency between frames.





Edited by mxthunder - 11/14/12 at 4:16pm
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post #35 of 37
Additionally, for those looking for more knowledge, here is a whitepaper that helps explain some of the details of how SLI works:

http://developer.download.nvidia.com/whitepapers/2011/SLI_Best_Practices_2011_Feb.pdf
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post #36 of 37
Thread Starter 
Great additions, thanks MX thumb.gif
    
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post #37 of 37
Did some more testing.

First result is TRI SLI GTX280's, same in game settings.
Second result is GTX480 SLI, game in game settings. It looks like microstutter has been greatly reduced with the fermi cards compared to Tesla.













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