With proper cooling you should be able to integrate the E5520 Processor(s) within any 1U chassis. Check out apaqdigital.com, they have a few setups similar to this and if you want to go commercial, you can check dell.com.
It shouldn't be an issue with Supermicro chassis designed for that CPU.
We use SUP CSE-815TQ-560CB for the E5500-Series and haven't had an issue running systems similar to yours (more RAM).
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I will get a new server with dual E5520 and 4 SAS 15K rpm (raid10) + 12GB RAM. Will they be hot in 1U chasis? I am only using Supermicro
Ive found that unless the chassis has or supports the squirrel cage fans it runs hot. CPUs at around 70+C idle (L5420) with all the fans on maximum and just 1 hard drive (off to the left so it doesn't block airflow) in a supermicro barebones (http://supermicro.com/products/syste...S-6015C-MT.cfm). I think the datacenter operates at 22C--my other servers in that rack are MUCH cooler than this one.
I have some E5530s in a 6016T-T and they are nice and cool only supports 2 drives though =/
The supermicro barebones that have the squirrel cage fans run MUCH cooler.
if you plan on adding in an Adaptec RAID card, you might have one very warm setup there, esp since the Adapatec's run warm and don't get much airflow.
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You might consider purchasing a cheaper Xeon processor, and going with the low voltage model. It will save you money in the long term on operating costs, and the performance for a lower end Xeon isn't much different.