They came in both flavors depending on rev level -- mine is a 64-bit / Core2 Duo version (can't see exactly which CPU at the moment 'cause it's at home) -- it's currently running CentOS 7.6 x86_64 like a champ with no compatibility limitations in re : modern software

Total agree with regard to hardware design / ergo superiority over the MBP -- that's exactly why I made the switch