I have Two Dell C6100 12 bay and 2 c6100 24 bay chassis. Each Chassis contain 4 nodes each with each node containing 2xl5520, 24gb of ram. The 12 bay versions contain the mellanox connectx-2 dual port infiniband mezzanine cards. The 24 bay versions have hp drive sleds and the lsi sas 1.0 sas controllers. Taking best offers. Thanks and have a great one.