Do you really think you need a fan? They only shipped with an Aluminium heat sink, although some were wider than others.
IMHO if I owned an A3640 in an A3000 desktop case, I'd want to throw on as much additional cooling as possible, in whatever way possible.
Disclaimer: I own neither of these pieces of equipment, just been reading about them for about the past 25 years or so. :roflmao:
