What's the difference between Sandisk's Ultra and Extreme III lines of memory cards?

Is there a noticeable difference in perfomance in my DSLR between the two? Or is it just fancy marketing?

What's the difference between Sandisk's Ultra and Extreme III lines of memory cards?
The only difference is in the speed at which you can advance to the next frame. For most practical purposes the Ultra and Ultra II perform just fine. The only advantage of the Extreme III


would be for professionals that take many shots in rapid succession. There shouldnt be any noticable difference in picture quality.

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