I'm talking about capability, not theoretical properties. Can any current so called quantum computers actually perform any computations faster than a classical one?

To be called a quantum computer, I would expect they should, but last I checked, all claims of quantum supremacy appear to be highly disputed.

I mean calling a quantum computer a machine that uses qbits to compute, completely ignores the reason why we are interested in them. You don't see millions of dollars poured into gear computers.