Metro Man, how do you know you're only doing 80kts? What if you're actually doing 100? What does your brief say?
If the ASIs read differently then one of them will read 80 before the other, at this stage the speed call or lack of should indicate a discrepancy. When I'm PF I still check cockpit indications as I'm the one who makes the decision to reject.
Airbus use the
STOP STOP STOP GO GO GO
model to deal with failures as speed increases.