Llano IGP vs SNB IGP vs IVB IGP

They should've enabled v-sync.

 

Tell that to RV770…

 

It was for me, when I used dual HD3870 and then dual HD4890.

 

It's too bad that it's probably impractical to make some GDDR5 SODIMMs. I don't even know if these chips support GDDR5. The lack of volume for a specialty DIMM like that would probably make the price crazy anyway.

 

Curious what this particular conclusion is based on...

 

It is for many, many people.

edit:
Clarification: It doesn't remove the problem, however it does make it less severe, even to point where it becomes unnoticeable

 

How does this work, exactly?

 

Unless you use triple-buffering, it should. The former produces MS even with single cards.

 

triple buffering causes micro stuttering with a single card setup?

 

We did benchmarks on that, the frametime still jumps up and down with vsync on

Without

With

 

Haswell with Dx11.1 igp ?

can we expect AMD's 7000 and/or nVidia's 600 series support Dx11.1? or it's pretty early you think
http://www.forum-3dcenter.org/vbulletin/showpost.php?p=8791048&postcount=245

 

maybe that's the single address space and coherency that AMD is adopting?

 

What are we looking at? Also, some statistical analysis on the dataset always helps. What's on 0y? I presume 0x is the frame-count? What are we measuring etc.?

 

Oh ye, sorry.

X-axis is frame-count, Y-axis is frametime converted into FPS equivalent ("realtime FPS instead of average over second like usually")

This particular test is 30 second period from Unigine Heaven bench

 

I would expect dx11.1 to drop with win8, so fall 2012.

 

I think it's noteworthy that the times where the FPS increases above 60 despite vsync are basically the exact same times that the FPS decreases substantially without vsync. So with vsync the "pre-rendered frames" buffer is being (partially?) depleted as performance drops temporarily, and then it gets filled back as fast as it can afterwards.

That is an inherent effect of all frame-based rendering and the same issue would exist with any setup. But I suppose it's a problem that AFR makes sudden temporary decreases in performance more likely, but I'm not sure by how much or how that graph would look with a single GPU.

 

Actually, that might be single card already, it's old data and the file naming doesn't give much
It has triple buffering enabled, too.

Here's double buffered with CrossFire 100% certain

Without v-sync


With v-sync