Made from commercial parts, in total, Roadrunner connects 6,562 dual-core AMD Opteron chips as well as 12,240 cell chips (on IBM Model QS22 blade servers). The Roadrunner system has 98 terabytes of memory, and is housed in 278 refrigerator-sized, IBM BladeCenter racks occupying 5,200 square feet. Its 10,000 connections - both Infiniband and gigabit Ethernet -- require 55 miles of fiber optic cable. Roadrunner weighs 500,000 lbs.