Do FAQ da Lexar (um dos maiores fabricantes de cartões de memória) localizado aqui :
Posso usar um cartão UHS-I com um dispositivo host SDHC?
Yes! All SD UHS-I cards can be used with all existing SDXC and SDHC devices (backwards compatible). Note that SDXC UHS-I cards are not compatible with SD or SDHC host devices, only with SDXC host devices. See the SDXC FAQ for more information. Although SD UHS-I cards can be used with all existing SDXC and SDHC devices, if you want to optimize UHS performance, select a device with the UHS-I logo: