Originally posted by sqrrl When the media operates faster than the camera can write - the camera becomes the bottleneck.
Faster cards, as in the extreme speed cards are more oriented to video where the camera is taking 30 8mp images a second endlessly, in Pentax cameras the bottleneck is definitely going to be the graphics processing circuitry, which isn't going to run faster due to a card having higher specs than the camera can use.
A fast card is better than a slow card, but you're just going to be wasting money buying cards that write much over the factory specs. Thus 95mbps (I'm just going with your figure here) is a good trade off of speed vs price - if you buy faster cards you get nothing more back for your money, if you buy too much slower the card can't keep up with the camera when shooting at full speed.
As for studies, I don't know, but I'd assume that camera reviewers would probably (each) have a standard test which they would use to test manufacturer claims.
Well... I can understand some of that. I was under the impression someone bought a Lexar 300mb/s card, and although experiencing the same buffer limits and write speeds as a 95mb/s card they did report that once the camera is 'locked up' and experiencing buffer issues that the 300mb/s card would clear that hurdle far quicker and let the user get back to shooting shots again vs the 95mb/s waiting times.
That's what I really want to know. I can also appreciate faster camera to PC transfer times, so I would consider a 300mb/s card if the actual 'clearing the buffer' benefit is there, and if so by how much difference? That's what I would like to know.