>> Henning Brauer wrote:
quoted text
>> >* Jeff Ross <jross@openvistas.net> [2010-03-02 16:59]:
>> >>I bought a replacement supermicro motherboard off fleabay that has 
>> >>dual Opteron 250 @2.4GHz.  The cpus have passive heatsinks, it is in 
>> >>a supermicro 2U chassis with 4 front fans.
>> >
>> >do you have the air shroud? this plastic thing that forms a "tunnel"
>> >over the heatsinks? it is required.
>> >
>> 
>> No, the motherboard didn't come with that.  If I can find one will 
>> that mean I don't need the active heatsinks?
>
>that's how supermicro delivers the 2U systems, so i'd say yes, you won't
need them.

I had this problem before, an old Cereal box + Scissors + tape fixed it
right up.  But your mileage may vary