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[dvHW] No micro stuttering on the Radeon HD 4870 X2?

post #1 of 23
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Quote:
VR Zone received some information from an anonymous source about the upcoming ATI Radeon HD 4870 X2 (R700), one of the interesting things is that unlike previous CrossFire or SLI setups this card won't be plagued by micro stuttering.
While Radeon 3870X2 relies on the PLX chip to communicate between the GPUs, 4870X2 GPUs will communicate with each other through the memory. Since the GDDR5 is clocked at 1800, the total bandwidth will be roughly 160 GB/s at 1 Gigabyte through the 256bit-bus, compared to the 8 GB/s of the PLX chip of the HD3870x2. Also 4870x2 WILL NOT have micro stuttering.
The Radeon HD 4870 X2 1GB GDDR5 will have 1050MHz shader clock, 1800MHz memory and 2x 256-bit memory bus. The core clock is defined by the add-in board partners and it's said that ASUS will have the fastest cards.
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post #2 of 23
I thought Micro stuttering was voted null and void as it was happening too quick for someone to even detect it? Or am I making up stories again
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post #3 of 23
Quote:
Originally Posted by IcedEarth View Post
I thought Micro stuttering was voted null and void as it was happening too quick for someone to even detect it? Or am I making up stories again
It's just one of those things where some people notice it and are bothered by it, while others simply cannot tell the difference. Just depends on the person.
post #4 of 23
I find it hard to believe that they have fixed this hardware issue. I think ATI might have minimised it but micro stuttering would be pretty hard to completely fix.
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post #5 of 23
Yay?

I'm not one of those people who notice micro-stuttering
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post #6 of 23
My friend has a 8800GT SLI set up and I don't notice it either
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post #7 of 23
What is micro-stuttering?
    
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post #8 of 23
Quote:
Originally Posted by Edberg View Post
What is micro-stuttering?
Stuttering that is micro

It's very quick/small stuttering that happens with multi-gpu configurations
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post #9 of 23
I dont notice it with my set up Btw good work Ati with remooving the chip that controls crossfire
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post #10 of 23
Quote:
Originally Posted by Edberg View Post
What is micro-stuttering?
It's an issue with the way that CrossFire/SLI drivers handle Alternate Frame Rendering Mode. Basically what happens (if I'm wrong or using terms incorrectly, please correct me) is a game will send the driver Frame A to be rendered. What the driver will do is send Frame A to the first GPU to be rendered and then request the next frame before A is done and send it to the second GPU to be rendered. What happens here is that Frames A&B are essentially rendered and completed at the same time. The problem is now when the game requests Frames C&D, it's going to take longer to update the screen from Frame B to Frame C than it did to update from Frame A to Frame B. The inconsistent rate at which each frame is rendered/drawn is experienced by some people as "microstuttering" because even though you can have a high framerate, the game still appears to stutter. Personally I don't notice it at all except at lower framerates where the game is unplayable anyway.

Maybe this will help the explanation a bit (note that these numbers are made up for illustrative purposes)

Frame A <-10ms-> Frame B <-40ms-> Frame C <-10ms-> Frame D <-40ms-> Frame E and so on.

Quote:
Originally Posted by MomijiTMO
I find it hard to believe that they have fixed this hardware issue. I think ATI might have minimised it but micro stuttering would be pretty hard to completely fix.
I don't really think they would necessarily need to make any hardware changes. As far as I know, the issue is specifically with the AFR method and not present with other multiGPU rendering methods such as SuperTiling. I think a driver fix isn't out of the question, all they would really have to do is delay the rendering of every other frame. Although I don't think this is an option they will likely take since it will appear to lower the benefit gained from using a multiGPU configuration, especially when you consider that not everyone notices it.
Edited by darkcloud89 - 6/7/08 at 7:29pm
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