Why Couchbase Erlang Service In 32 bit?


we are using couchbase server 2.2 with windows 2012 OS - 64 bit.
I can see now that memcache process (memcached.exe) is running under 64 bit installation but Erlang process (erl.exe) is running 32 bit and i am not getting why it is running under 32 bit.

Would it not better for performance if Erlang process run under 64 bit ?
Is there any other installation available for 64 bit version ?