System x® Trusted Platform Assurance, a built-in set of System x features and practices, forms a solid security foundation for your workloads. You can also deploy self-encrypting drives using the optional IBM Security Key Lifecycle Manager. System x servers achieved the highest reliability of any x86 servers.1 Diagnostic ools facilitate reduced downtime and costs. Select configurations of the x3550 M5 are part of the TopSeller Portfolio™, designed to meet the needs of small and midsized businesses. TopSeller models vary by country.