How about "ambit", which
Keep this as a measure of storage Density (itself important),
and find a more verblike term for calculations, which are a
form of action. Ambit would then be perfect (ambits ~= bits
per cubit or whatever) as a second measure term.
Then we have to come up with the unity ambit (or
whatever we
choose) machine,
I like 1 calculation per second here, esp for a logarithmic scale,
so as to keep all machines in the positive range. KIPS/KOPS was
a popular measure before MIPS.
John A.