Today I tested some Micro SD cards including my new Lexar 1800x.
On the X3 I set it to Raw only with full size 4:3 photos. Burst mode shooting 7 images at once. I did an average of at least two tests each.
Sandisk Ultra - 16 seconds
Lexar 633x (the one that comes with Inspire) - 14 seconds
Sandisk Extreme - 10 seconds
Lexar 1800x - 8 seconds
On the X3 I set it to Raw only with full size 4:3 photos. Burst mode shooting 7 images at once. I did an average of at least two tests each.
Sandisk Ultra - 16 seconds
Lexar 633x (the one that comes with Inspire) - 14 seconds
Sandisk Extreme - 10 seconds
Lexar 1800x - 8 seconds