On the manufacturer side, IBM has the lion's share of supercomputing behemoths with a whopping 243 systems out of the 500. That number includes the top three fastest machines, BlueGene/L, Blue Gene Watson, and ASC Purple. Behind IBM, the second biggest manufacturer is HP with 154 systems, while CNet says other manufacturers fail to surpass more than a handful of machines. Onto geography, 298 of the top 500 supercomputers are located in the U.S., 83 are in Europe, and 93 are in Asia. Europe and Asia have reversed positions since last November, when Europe had 100 machines and Asia had just 66.