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View Poll Results: Since I can only choose one, my SLI experience would best be described as:
No problems no stuttering, it's da bomb! 26 35.14%
Occasional problems and no stuttering. 8 10.81%
Too many problems but at least there’s no stuttering. 1 1.35%
No problems but some stuttering. 6 8.11%
Occasional problems and some stuttering. 13 17.57%
Too many problems and some stuttering. 3 4.05%
No problems but excessive stuttering. 5 6.76%
Occasional problems and excessive stuttering. 1 1.35%
Too many problems and excessive stuttering. 11 14.86%
Voters: 74. You may not vote on this poll

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Old 07-05-08, 11:21 PM   #25
Vanzagar
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Default Re: SLI issues/concerns and stuttering (GTX 200, 8, and 9 Series)

Yeah it's interesting how much greater the standard deviation has become, the question is now what can be done to tighten the SLI distribution and are there certain brands or combination of components that effect the distribution... something you'd think nVidia should be dedicateing a full time employee to figure out...

What is the brand name of your cards 101?

When some people say they don't see it and some do, I wonder if it's just peoples ability to detect it and it's there for everyone or if there are cases where it is really good and really bad, it's nice to see some empirical data...

rh
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Old 07-07-08, 09:33 AM   #26
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Default Re: SLI issues/concerns and stuttering (GTX 200, 8, and 9 Series)

SLI rocks.

I tried 2 HD4870's with a GiGabyte X48T DQ6 saturday. It was slow (a lot slower than GTX280 SLi), it was hot: 105C!!!!, it basicly sucked.

I never had any problems with SLi.

With GX2 cards I did have problems, but i'll never buy those again. 2 separate cards work better.
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Old 07-09-08, 04:49 PM   #27
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Default Re: SLI issues/concerns and stuttering (GTX 200, 8, and 9 Series)

Quote:
Originally Posted by spajdr View Post
Also enablind triple buffering under DX9/DX10 makes it pretty all much smooth.
Joke, right? Triple buffering doesnt work in AFR. Or was it changed with GT200?
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Old 07-09-08, 06:45 PM   #28
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Default Re: SLI issues/concerns and stuttering (GTX 200, 8, and 9 Series)

The triple buffering was a long standing issue of mine as well. I haven't fully tested it but it actually seems to be working in crysis. So maybe they finally fixed it after all these years.
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Old 07-10-08, 09:34 AM   #29
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Default Re: SLI issues/concerns and stuttering (GTX 200, 8, and 9 Series)

Quote:
Originally Posted by 101 View Post
The triple buffering was a long standing issue of mine as well. I haven't fully tested it but it actually seems to be working in crysis. So maybe they finally fixed it after all these years.
Are you sure? Crysis FPS is usually so low and stuttering..., that its hard to tell if vsync is actually on...
Any experience with other games @60 fps?
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Old 07-12-08, 06:51 PM   #30
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Default Re: SLI issues/concerns and stuttering (GTX 200, 8, and 9 Series)

im fascinated by this stuttering thing.
could it be caused by lack of bandwith on the pci express slots on the cheaper mobo's and would overclocking the pci express clock lessen it?
does it happen on both vista 64 and vista 32, and is it lessened by having 4 gigs of ram or more on a 64 bit os?
all these unanswered questions! we might have enough collective user experience to get definite answers. or someone with a lot of time on their hands could do a review on it or something.
not everyone is experiencing it, so there must be an answer somewhere.
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Old 07-14-08, 11:29 AM   #31
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Default Re: SLI issues/concerns and stuttering (GTX 200, 8, and 9 Series)

One thing that made a big difference in 'smoothness' to me was setting Vsync forced ON and Triple Buffering ON in the global settings on my 9800GX2. Since then, everything is SO smooth!!
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Old 07-14-08, 12:40 PM   #32
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Default Re: SLI issues/concerns and stuttering (GTX 200, 8, and 9 Series)

Too many Vista issues right now to call SLI a pleasant experience. And these issues aren't even SLI related but they certainly keep me from enjoying my SLI setup...
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Old 07-17-08, 06:43 PM   #33
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Default Re: SLI issues/concerns and stuttering (GTX 200, 8, and 9 Series)

Quote:
Originally Posted by grimreefer View Post
all these unanswered questions!
I'll try to answer...
Quote:
Originally Posted by grimreefer View Post
im fascinated by this stuttering thing.
could it be caused by lack of bandwith on the pci express slots on the cheaper mobo's and would overclocking the pci express clock lessen it?
No
Quote:
Originally Posted by grimreefer View Post
does it happen on both vista 64 and vista 32,
Yes
Quote:
Originally Posted by grimreefer View Post
and is it lessened by having 4 gigs of ram or more on a 64 bit os?
No

The stuttering is caused by non-uniform frame times. Example:
1. GPU1 gets available.
2. The game prepares frame for GPU1.
3. it takes 5ms for CPU to prepare a frame
4. GPU2 gets available.
5. The game thinks it takes (5ms) to render a frame, it updates the scene for 5ms interval.
6. The game prepares frame for GPU2.
7. it takes 50ms to render frame on GPU1.
8. GPU1 gets available.
9. The game thinks it takes (50ms) to render a frame, it updates the scene for 50ms interval.
....
As a result, you will get 2 almost identical images with little delay between them, then long delay, then another 2 almost identical images and so on.

The slower your CPU, the longer it takes to prepare a frame -> less stuttering.

So, there are 3 options to reduce stuttering:
1. Buy very very slow CPU
2. Disable AA, AF, shadows etc to make the game CPU limited
3. Enable Vsync (which doesnt work well in SLI because of lack of Triple Buffering, performance is about the same as with single card+TB)
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Old 07-17-08, 08:36 PM   #34
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Default Re: SLI issues/concerns and stuttering (GTX 200, 8, and 9 Series)

Quote:
Originally Posted by Neospy View Post
I'll try to answer...

The stuttering is caused by non-uniform frame times. Example:
1. GPU1 gets available.
2. The game prepares frame for GPU1.
3. it takes 5ms for CPU to prepare a frame
4. GPU2 gets available.
5. The game thinks it takes (5ms) to render a frame, it updates the scene for 5ms interval.
6. The game prepares frame for GPU2.
7. it takes 50ms to render frame on GPU1.
8. GPU1 gets available.
9. The game thinks it takes (50ms) to render a frame, it updates the scene for 50ms interval.
....
As a result, you will get 2 almost identical images with little delay between them, then long delay, then another 2 almost identical images and so on.

The slower your CPU, the longer it takes to prepare a frame -> less stuttering.

So, there are 3 options to reduce stuttering:
1. Buy very very slow CPU
2. Disable AA, AF, shadows etc to make the game CPU limited
3. Enable Vsync (which doesnt work well in SLI because of lack of Triple Buffering, performance is about the same as with single card+TB)
Sorry but that makes no sense do you have any articles/data to back that up? If you limit your cpu like you suggest then you'll just create another bottleneck...
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Old 07-19-08, 03:40 PM   #35
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Default Re: SLI issues/concerns and stuttering (GTX 200, 8, and 9 Series)

Quote:
Originally Posted by rhuala View Post
Sorry but that makes no sense do you have any articles/data to back that up?
The behavior i listed is what ive seen in my own programs.
Here is a large discussion about the issue:
http://forum.beyond3d.com/showthread.php?t=47683
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Old 07-19-08, 09:15 PM   #36
Vanzagar
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Default Re: SLI issues/concerns and stuttering (GTX 200, 8, and 9 Series)

Quote:
Originally Posted by Neospy View Post
The behavior i listed is what ive seen in my own programs.
Here is a large discussion about the issue:
http://forum.beyond3d.com/showthread.php?t=47683
Interestng post...thanks...
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