Normal
Maybe a little off topic but my anecdotal experience w/ devices listed as passive (especially Intel's server heatsinks and such) is that they assume there will be airflow (sometimes quite alot of it either from ducting or some form of air guide) from chassis fans. Its counter-intuitive to some extent but apparently "passive" doesn't necessarily mean "passive" in the way one might think it does so much as it just means "the fans are elsewhere in the box" these days.
