Hi,
I'm working with full article of microstuttering issue including tests in Crysis and Race Driver: GRID with ATI Radeon HD 4870 X2, ATI Radeon HD 4870 CrossFireX, ATI Radeon HD 3870 X2 and GeForce 9800 GX2.
Article will be published on Finnish hardware and overclocking site Muropaketti.com and translated to English.
Here is a sneak peak of what to expect:
I'm also waiting answers from AMD regarding this issue which I'll update to the article later.
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Update:
Here are charts showing the difference between frametimes with ATI Radeon HD 4870 X2, 4870 CrossFireX and single 4870 in Race Driver: GRID:
And GeForce 9800 GX2 and GeForce 9800 GX2 in single GPU mode:
Still waiting input from ATI for my questions about microstuttering.
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Update 2
Ok here is a short explanation about testing methods and graphs:
First of all, I'm using Race Driver: GRID demo and CrossFire and 9800 GX2 seem to work just FINE. With 1920x1200 resolution, 4xAA and 16xAF I get 66,9 FPS with single 4870, 73,4 FPS with 4870 CF and 75,6 FPS with 4870 X2:
(Red bar keskimääräinen is average FPS)
Second, the graphs I've showed here related to microstutterin ARE NOT intended to display performance but difference between frame rendering times. I have only recorded 2 seconds of gameplay and used first 30 frames from data.
If performance is 60 FPS.. that would mean graphics card renders 120 frames in 2 seconds. Since I have only used 30 frames to analyze the results and draw the graphs, it means gameplay of half a second (0,5s, 500 ms)!!! That's not enough to draw conclusion about perfromance...
... it might not be enough to draw conclusion about microstuttering either but in my own tests 30 frames already show clear pattern with ATI Radeon HD 3870 X2 and rendering problem where every other frame is being rendered after different time than every other.
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