Out of curiosity I tested my 5DIII for short bursts 4-5 photos at high FPS before the buffer gets full.
Bottom line, recording only RAW to either or both cards, the interval between all photos is .17-.18 sec. translating to 5.5 to 5.8 fps... 
No difference!
I am using a Lexar Extreme CF 16 GB card (120 mB/s) and a Sandisk Extreme Pro 16 GB SD card (95 mB/s).
The test was conducted shooting my smartphone at stopwatch so I can record 1/100th sec.
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