Originally posted by Gimbal 8.75MB/s sounds a bit slow, so I did a little test. I ripped off 24 raw pictures and timed the whole sequence from that I pressed the shutter until the busy lamp had gone out.
I still have the 1.01 firmware, and I used a 30MB/s card.
The pictures takes up 578MB on the card.
The camera was done writing after 34 seconds, that is 17MB/s written to the card.
That is what I experienced (maybe even a little faster up to 18,5 Mb/s on my classe 10 PQ1 card). I do quit often shoot in a burst DNG's and it's just waiting and waiting with these large files. The K-7 had the same write speed.
For this you still need the fastest cards classe 10 or else you don't even make these speeds.
For a next generation Pentax should probably design a new computerlayout: faster memory (its now DDR2 RAM) and faster CPU to consume and set aside all those data faster.
Has anyone used a SDXC card 64 GB (on German site from Pentax is stated for the 645D that that is the maximum cardsize).?