When Can Micro-Stuttering Be Seen?
In a nutshell, all of the time. The lower the average frame rate, the more the frame rate is perceived as being lower than the actual average frame rate. Thus, as bad luck would have it, a frame rate of 30 FPS may be perceived as merely 20 to 25 FPS. The human eye does, however, still notice differences in when frames show up on-screen beyond 60 FPS.
Currently, it seems like cards less powerful than the Radeon HD 6950 are not well-suited for dual-card CrossFire. Even if the frame rates look decent, the slower the GPU, the more pronounced you'll see micro-stuttering during gameplay.
When Can Micro-Stuttering Be Seen?
In a nutshell, all of the time. The lower the average frame rate, the more the frame rate is perceived as being lower than the actual average frame rate. Thus, as bad luck would have it, a frame rate of 30 FPS may be perceived as merely 20 to 25 FPS. The human eye does, however, still notice differences in when frames show up on-screen beyond 60 FPS.
Currently, it seems like cards less powerful than the Radeon HD 6950 are not well-suited for dual-card CrossFire. Even if the frame rates look decent, the slower the GPU, the more pronounced you'll see micro-stuttering during gameplay.