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Interesting thread going on here, thanks for taking the time to compile those results. My curiosity has always been, "just how does a 1-series camera RAW burst behave once it slows down due to the buffer being filled?"...it is the one answer that the numbers just don't reveal. Now, Rick Fisher's calculations begin to shed some light on this camera behavior, but short of actually seeing and hearing the 1Dx in action at that point, one is left to wonder just what the camera can do for them, speed-wise, at that point.
Well, my curiosity got the best of me and I went searching online to see if anyone had posted some field results showing the 1Dx's behavior at full-buffer. I found these three videos (they're short, less than 30-seconds each!) shooting with the 1Dx with the best-performing card on your list, the Lexar 1000x...
1DX 6fps raw ISO 200 with Lexar 1000x 32GB card - YouTube:
1DX 10fps raw ISO 200 with Lexar 1000x 32GB card - YouTube:
1DX 12fps raw ISO 200 with Lexar 1000x 32GB card - YouTube:
So, my question is, "are these clips accurately portraying the 1Dx's slow-down behavior when the buffer becomes full?"...in other words, "initial long burst to buffer fill, pause, short burst, pause, short burst, pause, short burst, pause, short burst, etc"? Rick's calculations led me to believe the camera was giving an approximately steady (constant) 4fps at buffer saturation.
Just trying to clear this all up in my head!