New Fire Tv stick with Alexa Remote 64 Bit

I just got today the new Fire tv Stick with the Alexa remote etc.. they write it has now QuAD CORE processor.

I try today to install the 64bit version of kodi 17 but it doesnt work.

the 32 Bit version works.. is the stick now a 64 bit or 32 Bit version ? I thought because they use a Quad Core processor it is a 64 Bit