Kirk Bocek wrote: 
William A. Mahaffey III wrote:

  
Monarch lists 3 1U all-copper-no-fan heat sinks that I bet would work.
Please note the speculative nature of that recommendation !!!! I have
been aiming for an Opteron based system for a while now, that's why I
joined this list :-).
    

I didn't find anything on NewEgg. I'll see what Monarch has. AMD's stock
fan and heat sink is about 50mm high. If I can get it down to about 25mm
I should be good to go.

Does anyone have any notes on heat sink-only cooling. I'm sure it
depends on airflow in the case (which is good in my case) but I'd like
to hear any experiences.

Roger that, extremely important observation. Monarch lists 1U heat sinks with fins aligned both ways, for about the same price. Pick the one with fins aligned with your case fans & you would probably be well off. *Speculation again* :-).

-- 
	William A. Mahaffey III
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	Remember, ignorance is bliss, but
	willful ignorance is LIBERALISM !!!!