Originally posted by BrianR Responsiveness would be easier to test by comparing a compatible card with an older standard in the d850. My point was it looked like you were attributing the 25% energy savings solely on the updated UHS, which I think is hard to isolate. I don't doubt that there is an energy savings (which is always great
!).
I do wonder what the cost increase would have been. I've no doubt that Ricoh looked into the option and then
flipped a coin made a sensible decision.
You can quantify the numbers. Take for example the GRIII's 200 image rating. If each file takes 1 seconds to get through the UHS-I bus that is 200 seconds total time they are held in the buffer which is over 3 minutes time. If UHS-II reduced this by 3 times they are in the buffer for only 1 minute. This is exactly what is happening with the D850 and most likely were the improved battery performance is coming from.
The more images you put in the buffer the longer they stay there. So if you shoot 5 images in succession. The 5th image is actually sitting in the buffer for 5 seconds which eats even more power. A full buffer has files waiting 12 13 14 15 seconds waiting to clear the buffer drawing power using UHS-I.
Ricoh/Pentax has always been this many generations behind with the SD bus. With the GRIII Ricoh added the 2GB internal memory to get around the limitations of UHS-I.