>I'm speculating the 7100 isn't fast enough to notice any >difference between individual Class 10 cards and a good SDHC >card is more than adequate (unless of course you need to >exceed the 32GB or whatever storage cap). > >Appreciate any tech specs, links, or insights...?
The definitive SD and CF card in-camera speed tests can be found here. The D7100 has not specifically been tested yet, but the D800/800e and D4 write speed tests are in the same ballpark.
Camera data management performance - writing a single shot to a card, emptying the buffer after a burst of shots, writing to one card while backup to the card in slot 2, etc., etc. - is a function of the speed at which the camera can write to a given SD card.
Rated speeds published by SanDisk, Lexar, Integral, and all the rest of the brands, are currently based on USB 3.0 data reads & writes between a computer hard drive and an external card reader. Nothing to do with actual card performance in the camera. So all of the published card speeds are unachievable in the camera. That's why the Rob Galbraith in-camera card tests are so important.