Running a Placid to power Buffalo III
Manual says to run a larger heatsink when installing the tridents.
Probably going to change the ones on the Placid BP powering the Legato, just seems way too hot

The manual speaks of the original Placid version running a Buffalo with Tridents. Depending on the configuration bigger heatsinks may be needed in that case, as that version was originally intended for loads up to 400mA.

In this case: for a Placid BP the load of a Legato may be a bit on the high side, certainly if you are using the Legato with a buffer. The newer HD BP version or running one with bigger heatsinks are solutions. But please check your temperatures before making a decision: the Placid series are shunt regulators, and as such are designed to dissipate the energy you don't use. High temperatures are a feature. It's impossible to tell if it's too hot without hard data.

@Brian: we could use more information on this part, this is a fairly common question. Fi. which heatsink temperature do you consider ok for running over long periods, what are the practical limits of the various versions under normal conditions.

If you get above 80C then you might consider larger heat sinks. :)