A high-end gaming personal computer can set you back around $5,000, a top-of-the-range Macbook Pro much the same. Chump change, however, compared to what you might end up paying for the Cheyenne, a former US government "super computer" that has been on auction for a week and is going-going but not yet gone, with the top bid slightly over $480,000. The auction was set to close on May 5 with the highest bid to "be considered for award of the sale," albeit with the US government reserving for itsel