I plan to use an SX6012 when they come out. I've decided to just stick with QDR since each node will have a Mellanox QDR ConnectX-2 adapters built into the motherboard and I found a got a great deal on ebay for a Mellanox MHQH29C-XTR ConnectX-2 VPI Dual Port Adapter Card at only $350. I want the SX6012 because it has the exact number of ports I need, its quiet, and its a managed IB switch.
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