We have a small linux cluster Oscar/CentOS 5.5: a master and 4 nodes. We are computing only on the nodes. The nodes are identical: 2 hexacores X5650 (so 2*6 cores per node). There are 24 Gb of RAM per nodes. All the cluster is connected with infiniband and the driver of open linux fabrics is used. The intel cluster Toolkit is installed on the master and on all the nodes.