Bitfury chips actually have 756 cores.

Sounds like they're using "unrolled" (i.e. crappy) cores.


Not exactly, they say they say each core has two units which "share work" across one "job".  Whatever that means. Presumably a nonce range, so one chip would work on nonce 0xFFFF0001 while the other would work on 0x0001FFFF, or some other distribution.