correct - Every now and then, I get a shipment with higher-speed processors, and that's when I can assemble them - combined with the correct clock setting for that processor. Whenever a reseller offers a certain speed, it will be the speed that is printed on the processor. That is also the speed that you get a warranty for. I will not sell any 1220 or 1232 boards with overclocked processors.
That does not mean that a single processor does not run at a higher speed. It means that I cannot provide the level of testing that's required for selling a card with 2 years warranty and customer support at a given price. If you overclock, you're on your own. If someone else overclocks and then sells to you, then this "someone else" will be responsible for the stability of your system.