For sake of argument let us assume the hefty rumours are true and the D5 can manage the equivalent of 3,276,800 (Hi-5 setting). Then we face the same definition issue seen earlier in computer industry regarding counting bytes. A numbering scheme using powers of 2 has cross-overs with a 10-based system, but the difference gets proportionally bigger as the actual numbers grow.
So, how should we count? Mebi (Mi, powers of 2) ISO or Mega (M, powers of 10) ISO?