This could very well be a case of irrational exuberance. Take a look at the camera. We know that Panasonic required a vent on the back of their S1H to do 6k. Look at most cinema cameras that do 6k or 8k. Fans are usually a must unless you have an exceptional heat sink and w/o an EVF. Add an EVF to a camera and you have lots of heat. Try doing 8k for any extended length and you'll have a shitload more of heat. Canon's 1DX Mark III is capable of up to 2,600 Mbs but has a body the size of a 1969 Bu