sentences:  Over time, it expanded to contain many supercomputers including the Intel Paragon, an IBM system based on the POWER3, an IBM system based on the POWER4, SGI Altix, and more recently, the Cray X1E, Cray XD1, Cray XT3, Cray XT4, Cray XT5, and Titan.The OLCF is a collaboration of the DOE-SC and a world-class team from national laboratories, research institutions, computing centers, universities, and vendors.It evaluates and deploys technology designed to maximize the performance of scientific applications and engages the scientific and engineering communities for the purpose of advancing science and technology research in the United States.