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REad the online manual for the 600ex-rt. THe sync speed is only 1/125th for cameras released prior to 2012. So if that is a concern you should avoid it for now. ...
That's odd. 600EX-RT sync speed with my 7D is 1/250 seconds.
Anyway, per my understanding, flash fires at really really high speed. So, the limitation of the sync speed depends on how fast your shutter curtains move. To be specific, it's how fast the second curtain has to come out before the first one goes across the frame.
I haven't seen that part of the manual, but would you mind explaining why the flash itself would limit the sync speed?
Good catch Wahoowa. I thought Sizeman's post about a 1/125 sec shutter speed limit was odd, but I didn't say anything, as I haven't used particularly high shutter speeds with it on my 1DIV. Since your comment, I checked the manual (nothing on this), and then tried it on the camera. My 600EX-RT works fine with the 1DIV for shutter speeds up to the camera's max of 1/300 sec. The 1DIV was first released in 2009.