The 160MFlOps of Cray-1 is the theoretical maximum of the implementation (as are the whatever FlOp/s numbers quoted by GPU vendors), while the numbers for Linux capable Broadcom SoCs in RaspberryPis are results from LINPACK. The Linpack benchmark is not exactly a representation of what you would compute on a supercomputer, but even this kind of semi-synthetic benchrmark will cause the Cray-1 to score significantly lower than the theoretical 160MFlOp/s.