Apple made an advertisement about the PowerMac G4 as a "supercomputer" because of onerous export controls related to encryption way back. It's more cheeky, I think, than serious. But then again, I haven't looked into it beyond just remembering that it happened.
>A Raspberry Pi outperforms a Cray-1 supercomputer, for instance.
In terms of compute power this is true. However in terms of design and aesthetics I still find the Cray much more charming than the Pi (even if you start adding fancy cases and so on).