To put it mildly, your guy's full of it. He's been smoking too much silicon thermal paste.
For starters, the kind of bin-sorting he describes is done for *all* CPUs, otherwise you wouldn't have the number of speed steps available that are available. Secondly, Intel juggles the numbers released in various speed categories in order to help prop up the price of higher speed parts. This is one reason they introduced clock-locking, such a high percentage of certain Pentium vintages ran well at higher-than-rated speeds that remarking became a real problem. This is one reason why so many of the earlier, lower speed (i.e. 500 MHz) 100 MHz FSB Coppermine run just fine plugged into a 133 MHz FSB motherboard.
