The Jaguar has a system memory of 362 terabytes, which is almost three times that of the second largest system. It can read and write files at 284 gigabytes per second and uses a 10-petabyte shared file system. Most of those components remain unchanged from the earlier versions of Jaguar. “That’s the beauty of Cray’s architecture,” says Fruehe. “Nothing else needs to be replaced.” Upgrading the 37,376 processors inside the Jaguar took just about a week, explains Fruehe. Eight chips are housed on a board along with heat sinks. Once the heat sinks are removed, the processors are unclipped and the upgraded chips are fit in. “It takes about five minutes to upgrade each board,” says Fruehe of the 4670 boards that the system has.