[M] Silicon Power Elite 256GB Class 10 UHS-I U1 microSDXC Card Review
 

Even if the Elite is declared as being UHS-I card with at least a 10MB/s write rate, it can go considerably faster than that as noted from our tests. Thanks to the format and adapter, it is compatible throughout a large range of devices, while the 256GB will be able to fit quite a bit of data!

http://www.madshrimps.be/articles/article/1001410/