The jasper units will almost certainly use less power than falcon units. Reduced process-size GPUs/CPUs always use less power (usually dramatically less) than their predecessors , and the jasper GPU is a reduced-process-size chip.
I'm surprised that anyone commenting on the OP would even question this.
EDIT: Less power consumed also means less heat, which will almost certainly reduce the failure rate. The big question is how much less heat and the resulting failure rate reduction.








