Quote Originally Posted by jnanian View Post
from what i have heard, there is "lore" "urban legend" that suggests
it is really "tmz1600", but "tmz3200" sounded better and was a cooler name, so
they used that as the name, and the "real" iso is 1600 ...
I'm not sure why you quote that as 'lore' or 'urban legend'. Kodak very clearly states in F-4016, pg 19:

The nominal speed is EI 1000 when the film is processed in KODAK PROFESSIONAL T-MAX Developer or KODAK PROFESSIONAL T-MAX RS Developer and Replenisher, or EI 800 when it is processed in other Kodak black-and-white developers. It was determined in a manner published in ISO standards. For ease in calculating exposure and for consistency with the commonly used scale of film-speed numbers, the nominal speed has been rounded to EI 800.

Because of its great latitude, you can expose this film at EI 1600 and yield negatives of high quality. There will be no change in the grain of the final print, but there may be a slight loss of shadow detail. When you need a higher speed, you can expose this film at EI 3200 or 6400. At these speeds, there will be a slight increase in contrast and graininess with additional loss of shadow detail.