65W Brick Cranks out 65W continuous?
What the heck? That doesn't make sense at all.
If you're machine is consuming 17.5W, your brick will on be consuming about 22 to 25 Watts (depending on conversion efficiency). You can verify this with one of those kill-a-watt gadgets.
But even better, it can be refuted with math. Electric power is amps of current through the load multiplied by the voltage across the load. P=IV.
These bricks are voltage regulated, usually around 19.5V for the bigger/hungrier laptops, at around 8 AMPS max. So if you're laptop is only consuming 17.5 Watts, it's still consuming 17.5W from the brick, but the brick is only delivering .9Amps.
Not to mention, most laptop bricks are oversized not for spikes in demand from the motherboard, but so that they can run the motherboard at maximum throughput while simultaneously charging your possibly depleted battery in a reasonable amount of time. Most of these motherboards will already run on much less juice than the rated power output of the power pack, but if you only supplied that much, you couldn't charge battery.
Finally, I hope he was not implying that the processor would have a 5% execution error rate on the running code, but that it was having to retry things at a 5% rate, or increase its power consumption to maintain no greater than 5%. I can't imagine how a programmer could begin to predict how analog noise (some of the most random information available) could effect your code flow.