Try looking at the Silverstorm switches. They were going for around $200. I bought a DDR 9024 a while back and it was pretty quiet - but then it's all relative. The Voltaire 4036 in the lab now can be heard from several rooms away. If I had enough CX4 to QSFP cables I would put the Silverstorm back in while I am doing my research because the Voltaire can be annoying. .
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