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What is microstuttering?

its when it seems like you're getting lag but in reality the frames are not coming in at the right intervals and you are getting like little short bits of freezing while playing the game. Its the best way i can think of explaining this phenomenon. They are alllmost too short to be noticed, but they arent so you notice them.
 
its a phenomanon when apparently a 2 card setup is slower then a one card setup even tho it is performing better and scoreing better and gettign better fps etc.. but due to microstuttering it isnt really faster because of this invisible phenomanon that doesnt happen but it does happen :confused: everybody throw out your second card its microstuttering!! :confused: even tho its 50% faster in everything its not really at the same time and yeah... okay... im done :p


edit: accually it does exist and its a problem for the miniority its minor though and doesnt happen as offten as people say its not a big issue.... but i couldnt help myself from being a smartass... its in my blood... i sowwie ;)
 
It's inconsistency in the timing of frames from each card, resulting in "clumping" of the frames rendered, mainly caused by incorrectly divided workload due to how AFR works and its prediction model. So, if you're getting 100FPS on a single card, they'll be spaced about 10ms apart every time consistently. If you're getting 100FPS on a dual-card setup, you'll see frames at say 1ms into the second, three at 8ms, then no frame until 21ms, and then one at 22ms and 23ms, until the next one arrives at 31ms then 40ms then four at 45ms... when they occur within a millisecond or so of eachother it's too quick to help contribute to fluid motion. You might see the equivalent of 30FPS at times or 70FPS, resulting in a juttery experience and losing many of the gained frames, which while technically rendered, did you no good in actual gameplay. In addition, driver issues plague many multi-card setups, and scaling isn't double, it's more like 30% to 70% in the best cases.
 
I get frame drops every here and there with my CF... Not exactly a "micro" stutter though. I'd classify it as a straight up "stutter"
 
How common is it? Every multi gpu solution has this problem?

Thanks for all the answers :)
 
All current multi-GPU solutions have this issue, because it is a result of how they work (Alternate Frame Rendering, AFR) :(.
 
I've never worked with a multi-gpu setup in recent years - is this something fixable by driver changes, or does there have to be a fundamental redesign of how the cards operate together in hardware?
 
It happens, but it isnt as big an issue as ppl make out, yes it exists, but remember their is more than 1 rendering method for sli, so if it happens in one rendering mode then change to another if possible, its just one of them things that people complain about but in my opinion it is over blown as people expect sli to work perfect with every single game out there which just isnt the case, is that nvidias fault ? I dont know but I would doubt it.

In all my time of running sli, only a handful of games I came across had micro stuttering, a quick change of rendering methods if the game allowed it quickly fixed the problem and in some cases it was better to run the game in single gpu mode.

Its just the way things are, but in my opinion it isnt this huge problem that people seem to think it is.
 
I noticed it alot in Mass Effect and thought it was the game loading on the fly..I was actually proud of my Raptors thinking if I didnt have them it would be worse..Come to find out,it was microstutter..Hello GTX 280..:p
 
I have seen this happen in single card settings as well. It is not a phenomenon isolated to multiple GPUs. The two games I mainly noticed it in with a single card were CoD4 and Crysis.

While there's an explanation why it happens with multiple gpus, I don't have any explanation as to why it's also seen with single gpu setups.
 
GoldenTiger said:
It's inconsistency in the timing of frames from each card, resulting in "clumping" of the frames rendered, mainly caused by incorrectly divided workload due to how AFR works and its prediction model. So, if you're getting 100FPS on a single card, they'll be spaced about 10ms apart every time consistently. If you're getting 100FPS on a dual-card setup, you'll see frames at say 1ms into the second, three at 8ms, then no frame until 21ms, and then one at 22ms and 23ms, until the next one arrives at 31ms then 40ms then four at 45ms... when they occur within a millisecond or so of eachother it's too quick to help contribute to fluid motion. You might see the equivalent of 30FPS at times or 70FPS, resulting in a juttery experience and losing many of the gained frames, which while technically rendered, did you no good in actual gameplay. In addition, driver issues plague many multi-card setups, and scaling isn't double, it's more like 30% to 70% in the best cases.
Click to expand...
^ Great explanation
 
a5i2c said:
I have seen this happen in single card settings as well. It is not a phenomenon isolated to multiple GPUs. The two games I mainly noticed it in with a single card were CoD4 and Crysis.

While there's an explanation why it happens with multiple gpus, I don't have any explanation as to why it's also seen with single gpu setups.
Click to expand...

Single-GPU fluctuations are usually called just "stuttering". Although the end effect is similar, the cause is different and could be a number of things: bad power supply, insufficient RAM (thus causing increased swapping to disk), etc. Microstuttering is always a multiple GPU rendering consistency issue.
 
Can Microstuttering occur when watching videos? Cause sometimes my videos lag.
 
Microstutter really just refers to the inconsistency in the spacing of frames being renderd. It's harder with a multi GPU setup to get evenly spaced frames, which is a large factor in a rendered scene appearing fluid.

Frame rate, and frame spacing with a single GPU is already very irregular, you read about "average fps" and look at numbers like 30fps or 60fps. But in reality these numbers are actually shooting up really fast.

Multigpu setups simply have an amplified effect and it becomes easier to see.

The problem is that all too many people run 30fps average which is very borderline on being jerky anyway, because at that average fps the minimum will be. I tend to play games at closer to 60fps average because I cant stand bad frame rates and at this frame rate the microstutter becomes harder to see.
 
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