The RDRAND circuits perform continual health checks and will signal a error instead of outputting bad data. See section 3.3 of http://software.intel.com/en-us/a

The RDRAND circuits perform continual health checks and will signal a error instead of outputting bad data. See section 3.3 of http://software.intel.com/en-us/articles/intel-digital-random-number-generator-drng-software-implementation-guide http://software.intel.com/en-us/articles/intel-digital-rando...