In mid-2003, Steve Jobs launched the Power Mac G5, based on IBM's G5 processor. Its all-metal anodized aluminum chassis finished Apple's transition away from colored plastics in their computers. Apple claims this was the first 64-bit computer sold to the general public. The Power Mac G5 was also used by Virginia Tech to build its prototype System X supercomputing cluster, which at the time was considered the third-fastest supercomputer in the world. It cost only US$5.2 million to build, far less than the previous No. 3 and other ranking supercomputers. Apple's Xserves were soon updated to use the G5 as well. They replaced the Power Mac G5 machines as the main building block of Virginia Tech's System X, which was ranked in November 2004 as the world's seventh-fastest supercomputer.