The amount of shots you will get in a burst is far more dependent on your camera settings, not really the card you are using.
Because in the burst it is filling the internal buffer prior to writing to the card.


If you are shooting RAW it will not shoot as many in a burst as it would if shooting JPEG, same with the compression setting you have on your JPEG shots.


Other variances in ISO and all the things that change the individual picture file size will play into your burst amount.


There is a chart ofestimated burst quantity in the manual also.