I think what intel meant was it is ok for your cores to be running at 80C as opposed to rma'ing the cpu to us
What cpu, I assume it is a quad q6x00 or q9xx0 and what cooling? And did they send you an email stating that?
Though they are just quoting the thermal specs, but given cpu temp may be a little off, with 80 core, you may be over thermal specs of cpu. Regardless, I would not tolerate temps that high.