EOS-1D X: maximum frame rate
All EOS cameras quote a maximum frame rate and in the case of the EOS-1D X, this is 12fps in normal shooting. When a situation requires you to achieve the very maximum frame rate possible, there are some steps to take in order to ensure the best possible performance: keep the ISO speed below 25,600, use a shutter speed of 1/1000sec or faster and use the maximum aperture of your lens. Additionally, if you have an IS lens, turn the IS off and also make sure AF is set to One Shot.
Check out CPN's full list of Tips and Tricks.