Hardware Best 32gb/64gb sd card?

[howcleanisyourho]

What 32gb or 64gb microsd cards do you guys recommend?

And at what point do the microsd cards become bottlenecked by the 3ds read write speeds

 

[TheDarkGreninja]

I use a sandisk extreme 32gb (write speed:30 read speed: 90). They get bottlenecked pretty early i believe at like class 5.