Sequoia is an SGI Altix XE cluster with 124 nodes, 1304 CPU cores, and 3,608 GB of memory with total performance of 13.68 TFLOPS. Each node contains two Intel Xeon processors. Nodes are connected using a mixture of DDR and QDR Infiniband. Parts of this cluster were purchased with funds provided by the National Science Foundation (EPS-0903787).
The newest nodes have 35GB of memory, but older nodes have less.