What’s also impressive about the latest TOP500 List is that 482 of the supercomputers run one version of Linux or the other. That’s more than 96%. Only two, ranked 237 and 309, run a Windows operating system. Eleven run IBM’s AIX (Advanced Interactive eXecutive) OS, and four run a mixed CNK/SLES 9 (Computer Node Kernel and SUSE Linux Enterprise Server). Only one runs Super-UX, a BSD-based operating system.