RamOne
Mr. Blue Sky
I was actually being sarcastic.I upgraded mine to a even more whopping 16GB, but I am aware the whopping limit is 32GB.
Previously it was a 4GB MicroSD card and even before that was the launch 2GB SD card, but that isn't valid.

I really should upgrade it to 8GB or something because I'm really interested in Rune Factory 4 and it's eShop only in Europe, but I don't know what the standard SD card size is for the New 3DS.