I dunno how likely that is but it's not impossible under the right circumstances. The 603e can have up to five instruction in execution at once and retire up to three of them per cycle under perfect circumstances.
So you could, in theory, get 3x your clockspeed operations/sec. But not in reality...
However, most ordinary code has on average 1-2 instructions per cycle so for a 240MHz (mine) 295 MIPS / 180 MFLOPS.
More likely I'd say the benchmarker is a bit confused. Maybe it doesn't have the correct clock speed?
