MultiGPU-antialiasing

AMD has Crossfire 16x SGSSAA that works on the same frame at the same time afaik. So one card provides 8 samples, the other one the other 8. This should completely eliminate microstuttering as it's not AFR anymore. However, this particular AA-mode seems to be slower than expected and doesn't provide that much of a image quality bonus compared to 8xSGSSAA.

I was wondering if it is possible to enable CF/SLI-SGSSAA with fewer samples like 4x or 8x and what efficiency (in general) and what scaling efficiency could be achieved. Lastly (if it would be beneficial): Why is it not implemented?
 
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