> microcode_ctl is seldom needed, just turn it off and rely on your bios to > properly update your CPUs. > and make sure your BIOS is updated and knows about your specific CPU ... AFAIK, this is mostly a Intel thing. If you look up the 'sspec' of your CPU in the specification updates on http://developer.intel.com, I believe it will describe what specific fixes were applied. some are trivial, some serious.