an itanium-based computer first appeared on the list of the top500 supercomputers in november 2001. the best position ever achieved by an "itanium 2" based system in the list was #2, achieved in june 2004, when thunder (llnl) entered the list with an rmax of 19.94 teraflops. in november 2004, columbia entered the list at #2 with 51.8 teraflops, and there was at least one itanium-based computer in the top 10 from then until june 2007. the peak number of itanium-based machines on the list occurred in the november 2004 list, at 84 systems (16.8%); by june 2012, this had dropped to one system (0.2%), and no itanium system remained on the list in november 2012.