Unless you know EXACTLY what you are doing, and
you have all of the correct engineering data in front of you,
I would NOT recommend passive coolers for any CPUs.
The question of noise emitted by the heatsink/fan ("HSF") assembly
really doesn't become an issue unless the fan is unusually loud,
chiefly because that HSF assembly is enclosed after a case's side panels
are installed.
If you are contemplating an Intel CPU, then you should understand
this WARNING because of what it confirms about the problems
many Intel customers have had with the "push-pins" on
the stock Intel HSF for LGA sockets (775, 1156 and 1366 pins):
http://www.supremelaw.org/systems/heatsinks/warning.htm
If a passive CPU cooler is not chosen carefully and integrated well
with the overall air flow inside a chassis, all current Intel CPUs
will either throttle the FSB multiplier, to "downclock" the CPU,
or it will just shut down, to prevent damage from overheating.
I tried this just once, to see how quickly the CPU would shut down:
without any heatsink whatsoever, it doesn't take very long
for an Intel CPU to shut down, because of the heat that it
generates, even when it is idling.
A simple solution like this $5 part solves a lot of problems,
many of which are caused by the defective push-pins on
Intel's stock HSF units:
http://www.sidewindercomputers.com/lgbowiscsp.html
Just plan ahead, because many cases do not have an opening
directly below the CPU socket, and the motherboard will need
to be removed in order to install the all important backing plate.
BEST WAY is to install the backing plate BEFORE the motherboard
is ever installed in the case. So, plan ahead before you "Leap Ahead"
MRFS
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